Note L - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating Loss Carryforwards, Valuation Allowance, Total	$ 0	$ 0
Percentage of Valuation Allowance	100.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	$ 300	24,000
Unrecognized Tax Benefits, Ending Balance	0	0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense, Total	0
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total	$ 68,300,000	66,000,000
Open Tax Year	2018 2019 2020
State and Local Jurisdiction [Member]
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$ (63,400,000)	$ (56,300,000)