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SOURCES OF INCOME (Details) (USD $) | 12 Months Ended
--- | ---
Mar. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2012 | Mar. 31, 2011
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |
Interest | $ 2,078,000 |  |  | $ 1,980,180 | $ 1,364,138
Dividends | 8,093,000 |  |  | 6,720,441 | 5,432,271
Management and other income |  |  |  | 633,616 | 771,738
Realized gain (loss) on investments before income tax | 89,557,814 |  |  | 11,826,876 | 63,462,583
Distributed net capital gains (in dollars per share) | $ 20.34 |  | $ 17.59 |  |
Companies more than 25% owned [Member] |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |
Interest | 0 |  |  | 0 | 0
Dividends | 6,944,214 |  |  | 5,553,140 | 5,024,061
Management and other income | 484,800 |  |  | 493,967 | 671,867
Realized gain (loss) on investments before income tax | 20,861,458 |  |  | (10,933,517) | 70,294,097
Companies 5% to 25% owned [Member] |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |
Interest | 250,298 |  |  | 253,652 | 0
Dividends | 868,560 |  |  | 1,006,572 | 326,940
Management and other income | 66,950 |  |  | 59,700 | 13,000
Realized gain (loss) on investments before income tax | 66,037,485 |  |  | (45,287) | (6,863,347)
Companies less than 5% owned [Member] |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |
Interest | 1,756,452 |  |  | 1,674,051 | 1,304,496
Dividends | 279,917 |  |  | 160,729 | 81,270
Management and other income | 111,963 |  |  | 79,250 | 0
Realized gain (loss) on investments before income tax | 2,658,871 |  |  | 22,805,680 | 31,833
Other sources, including temporary investment [Member] |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |
Interest | 71,136 |  |  | 52,477 | 59,642
Dividends | 0 |  |  | 0 | 0
Management and other income | 971 |  |  | 699 | 86,871
Realized gain (loss) on investments before income tax | 0 |  |  | 0 | 0
Realized gain before distribution [Member] |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |
Interest | 2,077,886 |  |  |  |
Dividends | 8,092,691 |  |  |  |
Management and other income | 664,684 |  |  |  |
Realized gain (loss) on investments before income tax | 89,557,814 |  |  |  |
Distribution from Realized Gain [Member] |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |
Interest | 0 |  |  |  |
Dividends | 0 |  |  |  |
Management and other income | 0 |  |  |  |
Realized gain (loss) on investments before income tax | (77,300,714) | [1] |  |  |
Realized gain after distribution [Member] |  |  |  |  |
Subsidiary or Equity Method Investee [Line Items] |  |  |  |  |
Interest | 2,077,886 |  |  |  |
Dividends | 8,092,691 |  |  |  |
Management and other income | 664,684 |  |  |  |
Realized gain (loss) on investments before income tax | $ 12,257,100 |  |  |  |
[1] | During the twelve months ended March 31, 2013, we distributed $77,300,714 or $20.34 per share of capital gains dividends.

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- Definition Revenue recognized in the period for (1) performance (incentive) fees based on the investment results achieved for management of certain institutional accounts and hedge funds, (2) schedule-based fees earned for management of mutual funds and closed-end funds, based either on average daily net assets or on a combination of the average daily net assets and gross income, and (3) other investment management and advisory fees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(a),(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-BRD -Paragraph 9, 51, 59 -IssueDate 2006-05-01 -Chapter 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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