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Note G - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2016 | Aug. 31, 2020 | Dec. 31, 2018 | Aug. 31, 2018 | May 31, 2013
Share-based Payment Arrangement, Expense | $ 800 | $ 1,100 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) | 87,747 | 126,696 |  |  |  | 171,369 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares) | 0 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share) |  | $ 1.67 |  |  |  |  |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 23 |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year 270 days |  |  |  |  |  |  |
Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $ 0 |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 1,400 |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 2 years 10 days |  |  |  |  |  |  |
Phantom Share Units (PSUs) [Member] |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 175 days |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $ 10 |  |  |  |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 75 |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 8 years 251 days |  |  |  |  |  |  |
Share- based Compensation Arrangement By Share-based Payment Award, Performance Measurement Period (Year) | 3 years |  |  |  |  |  |  |
Performance Shares [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Percentage Of Award, Shares To Be Issued, Based On Performance | 0.00% |  |  |  |  |  |  |
Performance Shares [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Percentage Of Award, Shares To Be Issued, Based On Performance | 100.00% |  |  |  |  |  |  |
Cash Performance Shares [Member] |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 0 |  |  |  |  |  |  |
Share- based Compensation Arrangement By Share-based Payment Award, Performance Measurement Period (Year) | 3 years |  |  |  |  |  |  |
Equity Incentive Plan 2020 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  | 2,521,244 |  |  |
Omnibus Incentive Plan 2013 [Member] | First Four Anniversaries [Member] | Phantom Share Units (PSUs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 25.00% |  |  |  |  |
Omnibus Incentive Plan 2013 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  | 500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | 20,700 | 18,000 |  |  | 0 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares) | 56,000 |  |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share) | $ 1.57 |  |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share) | $ 115.20 |  |  |  |  |  |  |
Omnibus Incentive Plan 2013 [Member] | Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) | 10 years |  |  |  |  |  |  |
Omnibus Incentive Plan 2013 [Member] | Cash Performance Shares [Member] |  |  |  |  |  |  |  |
Share- based Compensation Arrangement By Share-based Payment Award, Performance Measurement Period (Year) |  |  | 3 years | 3 years |  |  |  |
Omnibus Incentive Plan 2013 [Member] | Cash Performance Shares [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Percentage Of Award, Shares To Be Issued, Based On Performance | 0.00% |  |  |  |  |  |  |
Omnibus Incentive Plan 2013 [Member] | Cash Performance Shares [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Percentage Of Award, Shares To Be Issued, Based On Performance | 100.00% |  |  |  |  |  |  |
Omnibus Incentive Plan 2013 [Member] | First Four Anniversaries [Member] | Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 25.00% |  |  |  |  |
Omnibus Incentive Plan 2005 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  | 553,673 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  |  |  |  | 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares) | 32,000 |  |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit (in dollars per share) | $ 76.80 |  |  |  |  |  |  |
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit (in dollars per share) | $ 184.65 |  |  |  |  |  |  |
Equity Incentive Plan 2020 [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) | 2,000,000 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) | 0 |  |  |  |  |  |  |
Equity Incentive Plan 2020 [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) | 10 years |  |  |  |  |  |  |
Equity Incentive Plan 2020 [Member] | First Four Anniversaries [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 25.00% |  |  |  |  |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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