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Note B - Recent Accounting Pronouncements (Details Textual) - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Stockholders' Equity Attributable to Parent, Ending Balance	$ (53,123,000)	$ (49,683,000)		$ (19,184,000)
Cumulative Effect, Period of Adoption, Adjustment [Member]
Stockholders' Equity Attributable to Parent, Ending Balance				22,000
Retained Earnings [Member]
Stockholders' Equity Attributable to Parent, Ending Balance	796,123,000	797,817,000		812,704,000
Retained Earnings [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Stockholders' Equity Attributable to Parent, Ending Balance				11,377,000
Retained Earnings [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member] \| Accounting Standards Update 2016-02 [Member]
Stockholders' Equity Attributable to Parent, Ending Balance			$ (22,000)
AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent, Ending Balance	$ (65,611,000)	$ (63,134,000)		(46,483,000)
AOCI Attributable to Parent [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Stockholders' Equity Attributable to Parent, Ending Balance				$ (11,355,000)
AOCI Attributable to Parent [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member] \| Accounting Standards Update 2016-02 [Member]
Stockholders' Equity Attributable to Parent, Ending Balance			$ 22,000

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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