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Note I - Income Taxes (Details Textual) - USD ($) $ in Thousands		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%
Proceeds from Income Tax Refunds CARES Act		$ 17,100
Proceeds from Income Tax Refunds		9,600
Expected Proceeds from Income Tax Refunds, Carryback of Loss		7,500
Deferred Tax Assets, Valuation Allowance, Total		30,841	$ 38,379	$ 31,170
Unrecognized Tax Benefits, Ending Balance		0	0
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect			$ (11,355)
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total		21,600
Foreign Tax Authority [Member]
Operating Loss Carryforwards, Total		6,200
Tax Credit Carryforward, Amount		3,700
Operating Loss Carryforwards, Valuation Allowance, Total		6,200
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total		$ 90,300
Accounting Standards Update 2018-02 [Member]
Tax Cuts and Jobs Act, Reclassification from AOCI to Retained Earnings, Tax Effect	$ 11,400

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Represents expected proceeds from income tax refunds from carryback of the loss.

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he amount of cash received during the period as refunds for the overpayment of taxes for Cares Act.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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