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Note P - Stockholders' Equity (Details Textual) - USD ($) |  |  |  |  | 3 Months Ended | 9 Months Ended | 58 Months Ended | 231 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 05, 2021 | Nov. 06, 2020 | Aug. 07, 2020 | Jun. 12, 2020 | Dec. 27, 2020 | Dec. 29, 2019 | Dec. 27, 2020 | Dec. 29, 2019 | Dec. 27, 2020 | Dec. 27, 2020 | Sep. 18, 2019 | Mar. 11, 2016 | Sep. 13, 2012
Common Stock, Dividends, Per Share, Declared (in dollars per share) |  | $ 0.35 | $ 0.35 | $ 0.35 | $ 0.35 | $ 0.35 | $ 1.05 | $ 1.05 |  |  |  |  |
Payments of Ordinary Dividends, Common Stock |  | $ 1,440,000 | $ 1,440,000 | $ 1,440,000 |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  |  |  |  |  |  | 26,676 |  |  | 5,254,081 |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  | $ (0) | $ 985,000 | $ 1,501,000 | $ 985,000 |  | $ 84,770,000 |  |  |
Sixth Stock Repurchase Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  |  |  |  |  |  |  |  | 1,066,450 |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  | $ 37,108,000 |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  | 133,550 |  | 133,550 |  | 133,550 | 133,550 |  |  |
Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury Stock, Shares, Acquired (in shares) |  |  |  |  |  |  | 26,676 |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  | $ 1,501,000 |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) |  |  |  |  |  |  | $ 56.26 |  |  |  |  |  |
The 2010 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Increased Number of Shares Available for Issuance Due to Plan Amendment (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 250,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  |  |  |  |  |  |  | 208,584 |  |
The 2019 Stock Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  | 369,584 |  |
The 2019 Stock Incentive Plan [Member] | Shares Expired or Forfeited up to 100000 Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  |  |  |  |  |  |  | 11,000 |  |
The 2019 Stock Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  | 208,584 |  | 208,584 |  | 208,584 | 208,584 |  |  |
The 2019 Stock Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  | 184,808 |  | 184,808 |  | 184,808 | 184,808 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ 0.35 |  |  |  |  |  |  |  |  |  |  |  |

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