Note N - Income Taxes (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
State and Local Income Tax Expense (Benefit), Continuing Operations, Total	$ 22,000	$ (126,000)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	(24,544,000)	$ (56,592,000)
Operating Loss Carryforwards, Total	217,085,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total	$ 136,000,000
Operating Loss Carryforwards, Expiration, Beginning Year	2027
Operating Loss Carryforwards, Expiration, Ending Year	2037