Note I - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2014
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	34.00%
Income Tax Expense (Benefit), Total	$ 0	$ (36,000)	$ (1,080,000)
Deferred Income Tax Expense (Benefit), Total
Current Income Tax Expense (Benefit), Total		(36,000)	(1,080,000)
Tax Cuts and Jobs Act, Change in Tax Rate, Deferred Tax Asset Increase (Decrease)			(3,990,000)
Deferred Tax Assets, Valuation Allowance, Total	7,099,000	8,642,000		$ 8,140,000
Deferred Tax Assets, Operating Loss Carryforwards, Domestic	9,753,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		0
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Tax Cuts and Jobs Act , Amount			(3,990,000)
AMT Credit Carryforward [Member]
Deferred Income Tax Expense (Benefit), Total		$ (36,000)	(742,000)
General Business Tax Credit Carryforward [Member]
Current Income Tax Expense (Benefit), Total			$ (338,000)