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Note 8 - Stockholders' Equity (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2003
Dividends, Preferred Stock, Cash | $ 23,000 |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 33,695 | 33,695 |  |
Treasury Stock, Value, Ending Balance | $ 69,556,000 | $ 66,499,000 |  |
Treasury Stock, Shares, Ending Balance | 2,409,096 |  |  |
Treasury Stock [Member] |  |  |  |
Dividends, Preferred Stock, Cash |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 4,558,000 | $ 2,807,000 | $ 6,252,000 |
Defined Contribution Plan, Employer Discretionary Contribution Value of Shares | 1,500,000 |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Share Amount | 41,553 |  |  |
Convertible Preferred Stock Converted into Class A Common Stock [Member] |  |  |  |
Conversion of Stock, Shares Issued | 51,722 |  |  |
Convertible from Series A Preferred Stock to Class A Stock [Member] |  |  |  |
Share for Share Conversion Number | 20 |  |  |
Convertible from Series B Preferred Stock to Class A Stock [Member |  |  |  |
Share for Share Conversion Number | 30 |  |  |
Convertible from Series A Preferred Stock to Class B Stock [Member] |  |  |  |
Share for Share Conversion Number | 20 |  |  |
Convertible from Series B Preferred Stock to Class B Stock [Member] |  |  |  |
Share for Share Conversion Number | 30 |  |  |
Cumulative Preferred Stock [Member] |  |  |  |
Preferred Stock, Shares Authorized | 200,000 |  |  |
Preferred Stock, Dividend Rate, Percentage | 6.00% | 6.00% | 6.00% |
Preferred Stock, Par or Stated Value Per Share | $ 0.25 | $ 0.25 | $ 0.25 |
Preferred Stock, Shares Outstanding, Ending Balance | 200,000 | 200,000 | 200,000 |
Dividends, Preferred Stock, Cash | $ 3,000 | $ 3,000 | $ 3,000 |
No Par Value Preferred Stock [Member] |  |  |  |
Preferred Stock, Shares Authorized | 30,000 |  |  |
Preferred Class A [Member] |  |  |  |
Preferred Stock, Shares Authorized | 8,200,000 |  |  |
Preferred Stock, Par or Stated Value Per Share | $ 0.025 |  |  |
Preferred Stock, Shares Non-designated | 6,761,971 |  |  |
Series A Preferred Stock [Member] |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 10.00% |  |  |
Preferred Stock, Shares Outstanding, Ending Balance | 407,240 |  |  |
Dividends, Preferred Stock, Cash | $ 20,000 | 20,000 | 20,000 |
Series B Preferred Stock [Member] |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 10.00% |  |  |
Preferred Stock, Shares Outstanding, Ending Balance | 400,000 |  |  |
Dividends, Preferred Stock, Cash | $ 20,000 | $ 20,000 | $ 20,000 |
Convertible Preferred Stock [Member] |  |  |  |
Preferred Stock, Par or Stated Value Per Share | $ 11.931 |  |  |
Preferred Stock, Dividends Per Share, Declared | 0 | $ 0 | $ 0 |
Preferred Stock, Liquidation Preference Per Share | $ 12 |  |  |
Preferred Stock, Shares Outstanding, Ending Balance | 37,529 |  |  |
Preferred Stock, Dividends, Per Share, Cash Paid | $ 0 | 0 | 0 |
Series 2003 Convertible Preferred Stock [Member] |  |  |  |
Preferred Stock, Shares Authorized | 500 |  |  |
Preferred Stock, Par or Stated Value Per Share | $ 0.025 | $ 0.025 | $ 0.025 |
Preferred Stock, Liquidation Preference Per Share | $ 15.50 |  |  |
Preferred Stock, Shares Outstanding, Ending Balance | 500 | 500 | 500 |
Preferred Stock, Shares Issued, Total |  |  |  | 967,742
Sale of Stock, Price Per Share |  |  |  | $ 16.60
Common Class A [Member] |  |  |  |
Voting Rights, Percentage of Vote Per Share | 0.05% |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 38,029 | 89,751 |  |
Treasury Stock, Value, Acquired, Cost Method | $ 4,600,000 |  |  |
Treasury Stock, Shares, Acquired | 150,303 |  |  |
Common Class B [Member] |  |  |  |
Stock Issued During Period, Profit Sharing Bonus Plan | 0 |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 7,000 |  |  |
Treasury Stock, Shares, Acquired | 200 |  |  |

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