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CONSOLIDATED SCHEDULE OF INVESTMENTS (USD $) | 12 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011
Schedule of Investments [Line Items] |  |  |  |
Cost | $ 88,993,000 |  | $ 98,354,000 |
Value | 558,546,000 |  | 489,273,000 |
ALAMO GROUP INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Description of company | Tractor-mounted mowing and mobile excavation equipment for governmental, industrial and agricultural markets; street-sweeping equipment for municipalities. | [1],[2],[3],[4] |  |
Equity (in hundredths) | 22.00% | [1],[2],[3],[4],[5] | 22.00% | [1],[2],[3],[4],[5]
Investment | ‡2,832,300 shares common stock (acquired 4-1-73 thru 5-09-11) | [1],[2],[3],[4],[6] | 2,830,300 shares common stock (acquired 4-1-73 thru 5-25-07) | [1],[2],[3],[4],[6]
Cost | 2,190,937 | [1],[2],[3],[4] | 2,190,937 | [1],[2],[3],[4]
Value | 85,138,938 | [1],[2],[3],[4],[7] | 62,266,600 | [1],[2],[3],[4],[7]
ATLANTIC CAPITAL BANCSHARES, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 1.90% | [1],[2],[5] | 1.90% | [1],[2],[5]
Investment | 300,000 shares common stock (acquired 4-10-07) | [1],[2],[6] | 300,000 shares common stock (acquired 4-10-07) | [1],[2],[6]
Cost | 3,000,000 | [1],[2] | 3,000,000 | [1],[2]
Value | 2,299,000 | [1],[2],[7] | 2,257,000 | [1],[2],[7]
BALCO, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 95.70% | [1],[2],[3],[5] | 90.90% | [1],[2],[3],[5]
Investment | 445,000 shares common stock and 60,920 shares Class B non-voting common stock (acquired 10-25-83 and 5-30-02) | [1],[2],[3],[6] | 445,000 shares common stock and 60,920 shares Class B non-voting common stock (acquired 10-25-83 and 5-30-02) | [1],[2],[3],[6]
Cost | 624,920 | [1],[2],[3] | 624,920 | [1],[2],[3]
Value | 4,100,000 | [1],[2],[3],[7] | 5,200,000 | [1],[2],[3],[7]
BOXX TECHNOLOGIES, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 14.90% | [1],[2],[4],[5] | 14.90% | [1],[2],[4],[5]
Investment | 3,125,354 shares Series B Convertible Preferred Stock, convertible into 3,125,354 shares of common stock at $0.50 per share (acquired 8-20-99 thru 8-8-01) | [1],[2],[4],[6] | 3,125,354 shares Series B Convertible Preferred Stock, convertible into 3,125,354 shares of common stock at $0.50 per share (acquired 8-20-99 thru 8-8-01) | [1],[2],[4],[6]
Cost | 1,500,000 | [1],[2],[4] | 1,500,000 | [1],[2],[4]
Value | 600,000 | [1],[2],[4],[7] | 2 | [1],[2],[4],[7]
CINATRA CLEAN TECHNOLOGIES, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 73.40% | [1],[2],[5] | 68.80% | [1],[2],[5]
Cost | 13,563,842 | [1],[2] | 10,124,714 | [1],[2]
Value | 6,002,348 | [1],[2],[7] | 10,124,714 | [1],[2],[7]
CINATRA CLEAN TECHNOLOGIES, INC. [Member] | Investment Type 1 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | 12% subordinated secured promissory note, due 2016 (acquired 5-19-10 thru 10-20-10) | [1],[2],[6] | 12% subordinated secured promissory note, due 2012 (acquired 5-19-10 thru 10-20-10) | [1],[2],[6]
Cost | 779,278 | [1],[2] | 890,604 | [1],[2]
Value | 444,189 | [1],[2],[7] | 890,604 | [1],[2],[7]
CINATRA CLEAN TECHNOLOGIES, INC. [Member] | Investment Type 2 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | 12% subordinated secured promissory note, due 2017 (acquired 5-9-11 thru 10-26-11) | [1],[2],[6] | 10% subordinated secured promissory note, due 2013 (acquired 7-14-08 thru 4-28-10) | [1],[2],[6]
Cost | 2,285,700 | [1],[2] | 6,200,700 | [1],[2]
Value | 1,302,849 | [1],[2],[7] | 6,200,700 | [1],[2],[7]
CINATRA CLEAN TECHNOLOGIES, INC. [Member] | Investment Type 3 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | 12% subordinated secured promissory note, due 2016 (acquired 9-9-11 and 10-26-11) | [1],[2],[6] | 3,033,410 shares Series A Convertible Preferred Stock, convertible into 3,033,410 shares common stock at $1.00 per share (acquired 7-14-08 thru 11-18-10) | [1],[2],[6]
Cost | 1,264,754 | [1],[2] | 3,033,410 | [1],[2]
Value | 720,910 | [1],[2],[7] | 3,033,410 | [1],[2],[7]
CINATRA CLEAN TECHNOLOGIES, INC. [Member] | Investment Type 4 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | 10% subordinated secured promissory note, due 2017 (acquired 7-14-08 thru 4-28-10) | [1],[2],[6] |  |
Cost | 6,200,700 | [1],[2] |  |
Value | 3,534,399 | [1],[2],[7] |  |
CINATRA CLEAN TECHNOLOGIES, INC. [Member] | Investment Type 5 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | 3,033,410 shares Series A Convertible Preferred Stock, convertible into 3,033,410 shares common stock at $1.00 per share (acquired 7-14-08 thru 11-18-10) | [1],[2],[6] |  |
Cost | 3,033,410 | [1],[2] |  |
Value | 1 | [1],[2],[7] |  |
CINATRA CLEAN TECHNOLOGIES, INC. [Member] | Investment Type 6 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | Warrants to purchase 1,269,833 shares of common stock at $1.00 per share, expiring 2021 (acquired 5-9-11 thru 8-31-11) | [1],[2],[6] |  |
Cost | 0 | [1],[2] |  |
Value | 0 | [1],[2],[7] |  |
ENCORE WIRE CORPORATION [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 16.90% | [1],[2],[4],[5],[8] | 16.90% | [1],[2],[4],[5],[8]
Investment | ‡4,086,750 shares common stock (acquired 7-16-92 thru 10-7-98) | [1],[2],[4],[6],[8] | 4,086,750 shares common stock (acquired 7-16-92 thru 10-7-98) | [1],[2],[4],[6],[8]
Cost | 5,800,000 | [1],[2],[4],[8] | 5,800,000 | [1],[2],[4],[8]
Value | 121,458,210 | [1],[2],[4],[7],[8] | 81,735,000 | [1],[2],[4],[7],[8]
EXTREME INTERNATIONAL, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 53.60% | [1],[2],[5] | 53.60% | [1],[2],[5]
Cost | 3,325,875 | [1],[2] | 3,325,875 | [1],[2]
Value | 10,162,000 | [1],[2],[7] | 11,603,000 | [1],[2],[7]
EXTREME INTERNATIONAL, INC. [Member] | Investment Type 1 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | 13,035 shares Series A Common Stock (acquired 9-26-08 and 12-18-08) | [1],[2],[6] | 13,035 shares Series A Common Stock (acquired 9-26-08 and 12-18-08) | [1],[2],[6]
Cost | 325,875 | [1],[2] | 325,875 | [1],[2]
Value | 714,000 | [1],[2],[7] | 815,000 | [1],[2],[7]
EXTREME INTERNATIONAL, INC. [Member] | Investment Type 2 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | 39,359.18 shares Series C Convertible Preferred Stock, convertible into 157,437.72 shares of common stock at $25.00 per share (acquired 9-30-03) | [1],[2],[6] | 39,359.18 shares Series C Convertible Preferred Stock, convertible into 157,437.72 shares of common stock at $25.00 per share (acquired 9-30-03) | [1],[2],[6]
Cost | 2,625,000 | [1],[2] | 2,625,000 | [1],[2]
Value | 8,626,000 | [1],[2],[7] | 9,850,000 | [1],[2],[7]
EXTREME INTERNATIONAL, INC. [Member] | Investment Type 3 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | 3,750 shares 8% Series A Convertible Preferred Stock, convertible into 15,000 shares of common stock at $25.00 per share (acquired 9-30-03) | [1],[2],[6] | 3,750 shares 8% Series A Convertible Preferred Stock, convertible into 15,000 shares of common stock at $25.00 per share (acquired 9-30-03) | [1],[2],[6]
Cost | 375,000 | [1],[2] | 375,000 | [1],[2]
Value | 822,000 | [1],[2],[7] | 938,000 | [1],[2],[7]
HEELYS, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 31.10% | [1],[2],[3],[5],[8] | 31.60% | [1],[2],[3],[5],[8]
Investment | ‡9,317,310 shares common stock (acquired 5-26-00) | [1],[2],[3],[6],[8] | 9,317,310 shares common stock (acquired 5-26-00) | [1],[2],[3],[6],[8]
Cost | 102,490 | [1],[2],[3],[8] | 102,490 | [1],[2],[3],[8]
Value | 20,498,082 | [1],[2],[3],[7],[8] | 19,193,659 | [1],[2],[3],[7],[8]
HOLOGIC, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 1.00% | [1],[2],[5],[8] | 1.00% | [1],[2],[5],[8]
Investment | ‡632,820 shares common stock (acquired 8-27-99) | [1],[2],[6],[8] | ‡632,820 shares common stock (acquired 8-27-99) | [1],[2],[6],[8]
Cost | 220,000 | [1],[2],[8] | 220,000 | [1],[2],[8]
Value | 13,637,271 | [1],[2],[7],[8] | 14,042,276 | [1],[2],[7],[8]
iMEMORIES, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 25.30% | [1],[2],[5] | 27.20% | [1],[2],[5]
Cost | 5,078,479 | [1],[2] | 5,000,000 | [1],[2]
Value | 5,078,479 | [1],[2],[7] | 5,000,000 | [1],[2],[7]
iMEMORIES, INC. [Member] | Investment Type 1 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | 17,391,304 shares Series B Convertible Preferred Stock, convertible into 19,891,304 shares of common stock at $0.23 per share (acquired 7-10-09) | [1],[2],[6] | 10% convertible promissory note, due 2012 (acquired 9-13-10) | [1],[2],[6]
Cost | 4,000,000 | [1],[2] | 1,000,000 | [1],[2]
Value | 4,000,000 | [1],[2],[7] | 1,000,000 | [1],[2],[7]
iMEMORIES, INC. [Member] | Investment Type 2 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | 4,684,967 shares Series C Convertible Preferred Stock, convertible into 4,684,967 shares of common stock at $0.23 per share (acquired 7-20-11) | [1],[2],[6] | 17,391,304 shares Series B Convertible Preferred Stock, convertible into 17,391,304 shares of common stock at $0.23 per share (acquired 7-10-09) | [1],[2],[6]
Cost | 1,078,479 | [1],[2] | 4,000,000 | [1],[2]
Value | 1,078,479 | [1],[2],[7] | 4,000,000 | [1],[2],[7]
iMEMORIES, INC. [Member] | Investment Type 3 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | Warrants to purchase 2,500,000 shares of common stock at $0.12 per share, expiring 2020 (acquired 9-13-10 thru 1-21-11) | [1],[2],[6] | Warrant to purchase 968,750 shares of common stock at $0.12 per share, expiring 2020 (acquired 9-13-10) | [1],[2],[6]
Cost | 0 | [1],[2] | 0 | [1],[2]
Value | 0 | [1],[2],[7] | 0 | [1],[2],[7]
INSTAWARES HOLDING COMPANY, LLC [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Description of company | Provides services to the restaurant industry via its five subsidiary companies. | [1],[2] |  |
Equity (in hundredths) | 4.50% | [1],[2],[5] |  |
Investment | 3,846,154 Class D shares (acquired 5-20-11) | [1],[2],[6] |  |
Cost | 5,000,000 | [1],[2] |  |
Value | 5,000,000 | [1],[2],[7] |  |
KBI BIOPHARMA, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 17.10% | [1],[2],[5] | 17.10% | [1],[2],[5]
Investment | 7,142,857 shares Series B-2 Convertible Preferred Stock, convertible into 10,204,082 shares of common stock at $0.49 per share (acquired 9-08-09) | [1],[2],[6] | 7,142,857 shares Series B-2 Convertible Preferred Stock, convertible into 10,204,082 shares of common stock at $0.49 per share (acquired 9-08-09) | [1],[2],[6]
Cost | 5,000,000 | [1],[2] | 5,000,000 | [1],[2]
Value | 3,200,000 | [1],[2],[7] | 4,200,000 | [1],[2],[7]
MEDIA RECOVERY, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 97.90% | [1],[2],[5] | 97.50% | [1],[2],[5]
Cost | 5,415,000 | [1],[2],[3] | 5,415,000 | [1],[2],[3]
Value | 18,700,000 | [1],[2],[3],[7] | 18,100,000 | [1],[2],[3],[7]
MEDIA RECOVERY, INC. [Member] | Investment Type 1 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | 800,000 shares Series A Convertible Preferred Stock, convertible into 800,000 shares of common stock at $1.00 per share (acquired 11-4-97) | [1],[2],[6] | 800,000 shares Series A Convertible Preferred Stock, convertible into 800,000 shares of common stock at $1.00 per share (acquired 11-4-97) | [1],[2],[6]
Cost | 800,000 | [1],[2] | 800,000 | [1],[2]
Value | 3,100,000 | [1],[2],[7] | 3,000,000 | [1],[2],[7]
MEDIA RECOVERY, INC. [Member] | Investment Type 2 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | 4,000,002 shares common stock (acquired 11-4-97) | [1],[2],[3],[6] | 4,000,002 shares common stock (acquired 11-4-97) | [1],[2],[3],[6]
Cost | 4,615,000 | [1],[2],[3] | 4,615,000 | [1],[2],[3]
Value | 15,600,000 | [1],[2],[3],[7] | 15,100,000 | [1],[2],[3],[7]
PALLETONE, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 7.70% | [1],[2],[5] | 8.40% | [1],[2],[5]
Cost | 1,703,150 | [1],[2],[4] | 1,748,896 | [1],[2],[4]
Value | 2,000,002 | [1],[2],[4],[7] | 1,600,002 | [1],[2],[4],[7]
PALLETONE, INC. [Member] | Investment Type 1 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | 12.3% senior subordinated notes, $2,000,000 principal due 2015 (acquired 9-25-06) | [1],[2],[6] | 12.3% senior subordinated notes, $2,000,000 principal due 2015 (acquired 9-25-06) | [1],[2],[6]
Cost | 1,553,150 | [1],[2] | 1,553,150 | [1],[2]
Value | 2,000,000 | [1],[2],[4],[7] | 1,600,000 | [1],[2],[7]
PALLETONE, INC. [Member] | Investment Type 2 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | 150,000 shares common stock (acquired 10-18-01) | [1],[2],[4],[6] | 150,000 shares common stock (acquired 10-18-01) | [1],[2],[6]
Cost | 150,000 | [1],[2],[4] | 150,000 | [1],[2]
Value | 2 | [1],[2],[4],[7] | 2 | [1],[2],[7]
PALLETONE, INC. [Member] | Investment Type 3 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment |  |  | Warrant to purchase 15,294 shares of common stock at $1.00 per share, expiring 2011 (acquired 2-17-06) | [1],[2],[6]
Cost |  |  | 45,746 | [1],[2]
Value |  |  | 0 | [1],[2],[7]
THE RECTORSEAL CORPORATION [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 100.00% | [1],[2],[3],[5] | 100.00% | [1],[2],[3],[5]
Investment | 27,907 shares common stock (acquired 1-5-73 and 3-31-73) | [1],[2],[3],[6] | 27,907 shares common stock (acquired 1-5-73 and 3-31-73) | [1],[2],[3],[6]
Cost | 52,600 | [1],[2],[3] | 52,600 | [1],[2],[3]
Value | 166,300,000 | [1],[2],[3],[7] | 144,700,000 | [1],[2],[3],[7]
TCI HOLDINGS, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 0.00% | [1],[2],[5] | 0.00% | [1],[2],[5]
Investment | 21 shares 12% Series C Cumulative Compounding Preferred Stock (acquired 1-30-90) | [1],[2],[6] | 21 shares 12% Series C Cumulative Compounding Preferred Stock (acquired 1-30-90) | [1],[2],[6]
Cost | 0 | [1],[2] | 0 | [1],[2]
Value | 802,000 | [1],[2],[7] | 840,778 | [1],[2],[7]
TRAX HOLDINGS, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 29.40% | [1],[2],[5] | 30.70% | [1],[2],[5]
Investment |  |  | 1,061,279 shares Series A Convertible Preferred Stock, convertible into 1,077,203 common stock at $4.64 per share (acquired 12-8-08 and 2-17-09) | [1],[2],[6]
Cost | 8,200,000 | [1],[2] | 5,000,000 | [1],[2]
Value | 9,800,000 | [1],[2],[7] | 5,758,030 | [1],[2],[7]
TRAX HOLDINGS, INC. [Member] | Investment Type 1 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | 18% convertible promissory note, $3,200,000 principal due 2012 (acquired 4-6-11 thru 11-10-11) | [1],[2],[6] |  |
Cost | 3,200,000 | [1],[2] |  |
Value | 3,200,000 | [1],[2],[7] |  |
TRAX HOLDINGS, INC. [Member] | Investment Type 2 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment | 1,061,279 shares Series A Convertible Preferred Stock, convertible into 1,061,279 common stock at $4.64 per share (acquired 12-8-08 and 2-17-09) | [1],[2],[6] |  |
Cost | 5,000,000 | [1],[2] |  |
Value | 6,600,000 | [1],[2],[7] |  |
VIA HOLDINGS, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 3.20% | [1],[2],[5] | 28.10% | [1],[2],[5]
Investment | 12,686 shares common stock (acquired 3-4-11 and 3-25-11) | [1],[2],[6] | 12,686 shares common stock (acquired 3-4-11 and 3-25-11) | [1],[2],[6]
Cost | 4,926,290 | [1],[2] | 4,926,290 | [1],[2]
Value | 2 | [1],[2],[7] | 4 | [1],[2],[7]
WELLOGIX, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 19.10% | [1],[2],[4],[5] | 19.20% | [1],[2],[4],[5]
Investment | 4,788,371 shares Series A-1 Convertible Participating Preferred Stock, convertible into 4,788,371 shares of common stock at $1.0441 per share (acquired 8-19-05 thru 6-15-08) | [1],[2],[4],[6] | 4,788,371 shares Series A-1 Convertible Participating Preferred Stock, convertible into 4,788,371 shares of common stock at $1.0441 per share (acquired 8-19-05 thru 6-15-08) | [1],[2],[4],[6]
Cost | 5,000,000 | [1],[2],[4] | 5,000,000 | [1],[2],[4]
Value | 25,000 | [1],[2],[4],[7] | 2 | [1],[2],[4],[7]
THE WHITMORE MANUFACTURING COMPANY [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 80.00% | [1],[2],[3],[5] | 80.00% | [1],[2],[3],[5]
Investment | 80 shares common stock (acquired 8-31-79) | [1],[2],[3],[6] | 80 shares common stock (acquired 8-31-79) | [1],[2],[3],[6]
Cost | 1,600,000 | [1],[2],[3] | 1,600,000 | [1],[2],[3]
Value | 67,200,000 | [1],[2],[3],[7] | 55,600,000 | [1],[2],[3],[7]
ALL COMPONENTS, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) |  |  | 80.40% | [1],[2],[5]
Cost |  |  | 2,150,000 | [1],[2]
Value |  |  | 13,499,940 | [1],[2],[7]
ALL COMPONENTS, INC. [Member] | Investment Type 1 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment |  |  | 8.25% subordinate note, $2,000,000 principal due 2012 (acquired 6-27-07) | [1],[2],[6]
Cost |  |  | 2,000,000 | [1],[2]
Value |  |  | 2,000,000 | [1],[2],[7]
ALL COMPONENTS, INC. [Member] | Investment Type 2 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment |  |  | 150,000 shares Series A Convertible Preferred Stock; convertible into 600,000 shares of common stock at $0.25 per share (acquired 9-16-94) | [1],[2],[6]
Cost |  |  | 150,000 | [1],[2]
Value |  |  | 8,431,388 | [1],[2],[7]
ALL COMPONENTS, INC. [Member] | Investment Type 3 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment |  |  | Warrant to purchase 350,000 shares of common stock at $11.00 per share, expiring 2017 (acquired 6-27-07) | [1],[2],[6]
Cost |  |  | 0 | [1],[2]
Value |  |  | 3,068,552 | [1],[2],[7]
PALM HARBOR HOMES, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) |  |  | 30.40% | [1],[2],[3],[5],[8]
Cost |  |  | 10,931,955 | [1],[2],[3],[8]
Value |  |  | 2 | [1],[2],[3],[7],[8]
PALM HARBOR HOMES, INC. [Member] | Investment Type 1 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment |  |  | 7,855,121 shares common stock (acquired 1-3-85 thru 7-31-95) | [1],[2],[3],[6],[8]
Cost |  |  | 10,931,955 | [1],[2],[3],[8]
Value |  |  | 2 | [1],[2],[3],[7],[8]
PALM HARBOR HOMES, INC. [Member] | Investment Type 2 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment |  |  | Warrant to purchase 286,625 shares of common stock at $3.14 per share, expiring 2019 (acquired 4-24-09) | [1],[2],[3],[6],[8]
Cost |  |  | 0 | [1],[2],[3],[8]
Value |  |  | 0 | [1],[2],[3],[7],[8]
PHI HEALTH, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) |  |  | 67.00% | [1],[2],[5]
Cost |  |  | 5,752,339 | [1],[2]
Value |  |  | 5,752,339 | [1],[2],[7]
PHI HEALTH, INC. [Member] | Investment Type 1 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment |  |  | 1,559,111 shares Series A-1 Convertible Preferred Stock convertible into 1,559,111 shares of common stock at $0.0015 per share (acquired 1-27-11) | [1],[2],[6]
Cost |  |  | 2,339 | [1],[2]
Value |  |  | 2,339 | [1],[2],[7]
PHI HEALTH, INC. [Member] | Investment Type 2 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment |  |  | 555,556 shares Series B-1 Convertible Preferred Stock convertible into 555,556 shares common stock at $2.25 per share (acquired 1-27-11) | [1],[2],[6]
Cost |  |  | 1,250,000 | [1],[2]
Value |  |  | 1,250,000 | [1],[2],[7]
PHI HEALTH, INC. [Member] | Investment Type 3 [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investment |  |  | 4,500,000 Shares Series C-1 Convertible Preferred Stock convertible into 4,500,000 shares common stock at $0.20 per share (acquired 1-7-11 and 1-27-11) | [1],[2],[6]
Cost |  |  | 4,500,000 | [1],[2]
Value |  |  | 4,500,000 | [1],[2],[7]
TEXAS CAPITAL BANCSHARES, INC. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) |  |  | 1.60% | [1],[2],[5],[8]
Investment |  |  | ‡489,656 shares common stock (acquired 5-1-00) | [1],[2],[6],[8]
Cost |  |  | 3,550,006 | [1],[2],[8]
Value |  |  | 12,711,470 | [1],[2],[7],[8]
Ballast Point Ventures II, L.P. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 0.00% | [1],[2],[5] | 0.00% | [1],[2],[5]
Investment | Ballast Point Ventures II, L.P. 2.2% limited partnership interest (acquired 8-4-08 thru 6-18-10) | [1],[2],[6] | Ballast Point Ventures II, L.P. 2.2% limited partnership interest (acquired 8-4-08 thru 6-18-10) | [1],[2],[6]
Cost | 1,725,000 | [1],[2] | 1,200,000 | [1],[2]
Value | 1,551,000 | [1],[2],[7] | 1,200,000 | [1],[2],[7]
BankCap Partners Fund I, L.P. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 0.00% | [1],[2],[5] | 0.00% | [1],[2],[5]
Investment | BankCap Partners Fund I, L.P. 5.5% limited partnership interest (acquired 7-14-06 thru 11-30-11) | [1],[2],[6] | BankCap Partners Fund I, L.P. 5.5% limited partnership interest (acquired 7-14-06 thru 12-13-10) | [1],[2],[6]
Cost | 5,808,470 | [1],[2] | 5,762,270 | [1],[2]
Value | 5,012,000 | [1],[2],[7] | 5,101,727 | [1],[2],[7]
CapitalSouth Partners Fund III, L.P. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 0.00% | [1],[2],[5] | 0.00% | [1],[2],[5]
Investment | CapitalSouth Partners Fund III, L.P. 1.9% limited partnership interest (acquired 1-22-08 and 11-16-11) | [1],[2],[6] | CapitalSouth Partners Fund III, L.P. 1.9% limited partnership interest (acquired 1-22-08 and 2-12-09) | [1],[2],[6]
Cost | 1,331,256 | [1],[2] | 831,256 | [1],[2]
Value | 1,438,000 | [1],[2],[7] | 790,000 | [1],[2],[7]
CapStar Holdings Corporation [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 100.00% | [1],[2],[3],[5] | 100.00% | [1],[2],[3],[5]
Investment | ¥CapStar Holdings Corporation 500 shares common stock (acquired 6-10-10) | [1],[2],[3],[6] | ¥CapStar Holdings Corporation 500 shares common stock (acquired 6-10-10) | [1],[2],[3],[6]
Cost | 3,703,619 | [1],[2],[3] | 3,703,619 | [1],[2],[3]
Value | 5,338,000 | [1],[2],[3],[7] | 4,380,481 | [1],[2],[3],[7]
Diamond State Ventures, L.P. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 0.00% | [1],[2],[5] | 0.00% | [1],[2],[5]
Investment | Diamond State Ventures, L.P. 1.4% limited partnership interest (acquired 10-12-99 thru 8-26-05) | [1],[2],[6] | Diamond State Ventures, L.P. 1.4% limited partnership Interest (acquired 10-12-99 thru 8-26-05) | [1],[2],[6]
Cost | 76,000 | [1],[2] | 76,000 | [1],[2]
Value | 184,000 | [1],[2],[7] | 177,996 | [1],[2],[7]
Discovery Alliance, LLC [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 0.00% | [1],[2],[3],[5] | 0.00% | [1],[2],[3],[5]
Investment | ¥Discovery Alliance, LLC 90.0% limited liability company (acquired 9-12-08 thru 10-20-11) | [1],[2],[3],[6] | ¥Discovery Alliance, LLC 90.0% limited liability company (acquired 9-12-08 thru 5-14-10) | [1],[2],[3],[6]
Cost | 1,180,000 | [1],[2],[3] | 900,000 | [1],[2],[3]
Value | 1,280,000 | [1],[2],[3],[7] | 574,488 | [1],[2],[3],[7]
Essex Capital Corporation [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) |  |  | 0.00% | [1],[2],[5]
Investment |  |  | Essex Capital Corporation 10% unsecured promissory note due 8-19-10 (acquired 8-16-09) | [1],[2],[6]
Cost |  |  | 0 | [1],[2]
Value |  |  | 1,000,000 | [1],[2],[7]
First Capital Group of Texas III, L.P. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 0.00% | [1],[2],[5] | 0.00% | [1],[2],[5]
Investment | First Capital Group of Texas III, L.P. 3.0% limited partnership interest (acquired 12-26-00 thru 8-12-05) | [1],[2],[6] | First Capital Group of Texas III, L.P. 3.0% limited partnership interest (acquired 12-26-00 thru 8-12-05) | [1],[2],[6]
Cost | 778,895 | [1],[2] | 778,894 | [1],[2]
Value | 662,000 | [1],[2],[7] | 407,731 | [1],[2],[7]
Humac Company [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 100.00% | [1],[2],[3],[5] | 100.00% | [1],[2],[5]
Investment | ¥Humac Company 1,041,000 shares common stock (acquired 1-31-75 and 12-31-75) | [1],[2],[3],[6] | ¥Humac Company 1,041,000 shares common stock (acquired 1-31-75 and 12-31-75) | [1],[2],[6]
Cost | 0 | [1],[2],[3] | 0 | [1],[2]
Value | 159,000 | [1],[2],[3],[7] | 166,000 | [1],[2],[7]
STARTech Seed Fund I [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 0.00% | [1],[2],[5] | 0.00% | [1],[2],[5]
Investment | STARTech Seed Fund I 12.1% limited partnership interest (acquired 4-17-98 thru 1-5-00) | [1],[2],[6] | STARTech Seed Fund I 12.1% limited partnership interest (acquired 4-17-98 thru 1-5-00) | [1],[2],[6]
Cost | 178,066 | [1],[2] | 178,066 | [1],[2]
Value | 39,000 | [1],[2],[7] | 52,606 | [1],[2],[7]
STARTech Seed Fund II [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 0.00% | [1],[2],[5] | 0.00% | [1],[2],[5]
Investment | STARTech Seed Fund II 3.2% limited partnership interest (acquired 4-28-00 thru 2-23-05) | [1],[2],[6] | STARTech Seed Fund II 3.2% limited partnership interest (acquired 4-28-00 thru 2-23-05) | [1],[2],[6]
Cost | 843,891 | [1],[2] | 843,891 | [1],[2]
Value | 371,000 | [1],[2],[7] | 317,392 | [1],[2],[7]
Sterling Group Partners I, L.P. [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Equity (in hundredths) | 0.00% | [1],[2],[5] | 0.00% | [1],[2],[5]
Investment | Sterling Group Partners I, L.P. 1.7% limited partnership interest (acquired 4-20-01 thru 1-24-05) | [1],[2],[6] | Sterling Group Partners I, L.P. 1.6% limited partnership interest (acquired 4-20-01 thru 1-24-05) | [1],[2],[6]
Cost | 1,064,042 | [1],[2] | 1,064,042 | [1],[2]
Value | $ 511,000 | [1],[2],[7] | $ 919,417 | [1],[2],[7]
[1] | The descriptions of the companies and ownership percentages shown in the Consolidated Schedule of Investments were obtained from published reports and other sources believed to be reliable. Acquisition dates indicated are the dates specific securities were acquired, which may differ from the original investment dates. Certain securities were received in exchange for or upon conversion or exercise of other securities previously acquired.
[2] | Agreements between certain issuers and the Company provide that the issuer will bear substantially all costs in connection with the disposition of common stock, including those costs involved in registration under the Securities Act of 1933, but excluding underwriting discounts and commissions. These agreements cover common stock owned at March 31, 2012 and common stock which may be acquired thereafter through the exercise of warrants and conversion of debentures and preferred stock. They apply to restricted securities of all issuers in the investment portfolio of the Company except securities of the following issuers which are not obligated to bear registration costs: Humac Company and The Whitmore Manufacturing Company.
[3] | Control investment
[4] | Affiliated investments
[5] | The percentages in the "Equity" column express the potential equity interests held by Capital Southwest Corporation and Capital Southwest Venture Corporation (together, the "Company") in each issuer. Each percentage represents the amount of the issuer's common stock the Company owns or can acquire as a percentage of the issuer's total outstanding common stock, plus stock reserved for all warrants, convertible securities and employee stock options.
[6] | Unrestricted securities (indicated by ‡) are freely marketable securities having readily available market quotations. All other securities are restricted securities, which are subject to one or more restrictions on resale and are not freely marketable. At March 31, 2012, restricted securities represented approximately 56.9% of the value of the consolidated investment portfolio. Our investments are carried at fair value in accordance with the Investment Company Act of 1940 (the "1940 Act") and FASB Accounting Standards Codification™ (ASC) Topic 820, Fair Value Measurements and Disclosures. In accordance with the 1940 Act, unrestricted minority-owned publicly traded securities, for which the market quotations are readily available, are valued at the closing sale price for the NYSE listed securities and the lower of the closing bid price or the last sale price for NASDAQ securities on the valuation date; and other privately held securities are valued as determined in good faith by our Board of Directors. ASC Topic 820 defines fair value in terms of the price that would be received upon the sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (the "exit price") and excludes transaction costs. Under ASC Topic 820, the fair value measurement also assumes that the transaction to sell an asset occurs in the principal market for the asset or, in the absence of a principal market, the most advantageous market for the asset. The principal market is the market in which the reporting entity would sell or transfer the asset with the greatest volume and level of activity for the asset. In determining the principal market for an asset or liability under ASC Topic 820, it is assumed that the reporting entity has access to the market as of the measurement date.
[7] | Debt Securities are generally valued on the basis of the price the security would command in order to provide a yield-to-maturity equivalent to the present yield of comparable debt instruments of similar quality. Issuers whose debt securities are judged to be of poor quality and doubtful collectability may instead be valued by assigning percentage discounts commensurate with the quality of such debt securities. Debt securities may also be valued based on the resulting value from the sale of the business at the estimated fair market value. Partnership Interests, Preferred Equity and Common Equity, including unrestricted marketable securities are valued at the closing sale price for the NYSE listed securities and the lower of the closing bid price or the last sale price for NASDAQ securities on the valuation date.For those without a principal market, the Board of Directors considers the financial condition and operating results of the issuer; the long-term potential of the business of the issuer; the market for and recent sales prices of the issuer's securities; the values of similar securities issued by companies in similar businesses; the proportion of the issuer's securities owned by the Company. In determining the fair value of restricted securities, the Board of Directors considers the inherent value of such securities without regard to the restrictive feature and adjusts for any diminution in value resulting from restrictions on resale. Investments in certain entities that calculate net asset value per share (or its equivalent) and for which fair market value is not readily determinable, are valued using the net asset value per share (or its equivalent, such as member units or ownership interest in partners' capital to which a proportionate share of net assets is attributed) of the investment. Equity Warrants are valued on the basis of the Black-Scholes model which defines the market value of a warrant in relation to the market price of its common stock, share price volatility, and time to maturity.
[8] | Publicly-owned company

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