Note L - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards, Valuation Allowance, Total	$ 0	$ 0
Operating Loss Carryforwards, Total	$ 39,400,000	30,800,000
Percentage of Valuation Allowance	100.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	$ 18,000	24,000
Unrecognized Tax Benefits, Ending Balance	$ 0	0
Open Tax Year	2016 2017 2018
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total	$ 59,000,000	$ 65,300,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	$ 56,700,000