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Note 9 - Capital Stock (Details Textual) - USD ($) |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 13, 2019 | May 13, 2019 | Jun. 08, 2018 | May 08, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Apr. 30, 2017
Common Stock, Shares Authorized |  |  |  |  | 40,000,000 | 40,000,000 |  |
Common Stock, Par or Stated Value Per Share |  |  |  |  | $ 0.01 | $ 0.01 |  |
Preferred Stock, Shares Authorized |  |  |  |  | 10,000,000 | 10,000,000 |  |
Preferred Stock, Par or Stated Value Per Share |  |  |  |  | $ 0.01 | $ 0.01 |  |
Common Stock, Shares, Issued, Total |  |  |  |  | 11,656,160 | 11,612,144 |  |
Common Stock, Shares, Outstanding, Ending Balance |  |  |  |  | 5,748,897 | 5,956,558 |  |
Preferred Stock, Shares Issued, Total |  |  |  |  | 0 | 0 |  |
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  | $ 14,285,000 | $ 13,369,000 | $ 6,348,000 |
Treasury Stock, Shares, Ending Balance |  |  |  |  | 5,907,263 | 5,655,586 |  |
Treasury Stock, Value, Ending Balance |  |  |  |  | $ 156,836,650 | $ 142,552,000 |  |
The 2019 Tender Offer [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  | 200,000 |  |  |  |  |  |
Stock Repurchase Program Additional Shares Authroized To Be Repurchased Percent Of Outstanding Shares Percent |  | 2.00% |  |  |  |  |  |
Stock Repurchase Program Additional Shares Authorized To Be Repurchased Percent Of Outstanding Shares, Shares |  | 118,996 |  |  |  |  |  |
Treasury Stock, Shares, Acquired | 192,743 |  |  |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share | $ 60 |  |  |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 11,600,000 |  |  |  |  |  |  |
The 2019 Tender Offer [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share |  | $ 55 |  |  |  |  |  |
The 2019 Tender Offer [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share |  | $ 60 |  |  |  |  |  |
The 2018 Tender Offer [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  | 100,000 |  |  |  |
Stock Repurchase Program Additional Shares Authroized To Be Repurchased Percent Of Outstanding Shares Percent |  |  |  | 2.00% |  |  |  |
Stock Repurchase Program Additional Shares Authorized To Be Repurchased Percent Of Outstanding Shares, Shares |  |  |  | 124,248 |  |  |  |
Treasury Stock, Shares, Acquired |  |  | 185,597 |  |  |  |  |
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 40 |  |  |  |  |
Treasury Stock, Value, Acquired, Cost Method |  |  | $ 7,500,000 |  |  |  |  |
The 2018 Tender Offer [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share |  |  |  | $ 39 |  |  |  |
The 2018 Tender Offer [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Treasury Stock Acquired Cost Per Share |  |  |  | $ 43 |  |  |  |
September 2011 Reauthorization [Member] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  |  |  | 500,000
Treasury Stock, Shares, Acquired |  |  |  |  | 58,934 | 101,754 |  |

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