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Note T - Income Taxes (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Expense (Benefit), Total	$ 0	$ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total	0	$ 0
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards, Total	61,000
Operating Loss Carryforwards, Subject to Expiration	46,000
Operating Loss Carryforwards, Not Subject to Expiration	$ 15,000
Open Tax Year	2018

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Amount of operating loss carryforward not subject to expiration, before tax effects, available to reduce future taxable income under enacted tax laws.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Tax year that remains open to examination under enacted tax laws, in YYYY format.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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