Note 2 - Income Taxes - Income Taxes Reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Expected provision for federal income taxes	$ (136,000)	$ (207,000)
State income taxes, net of federal benefit	(24,000)	(7,000)
Permanent items	(249,000)	11,000
Research and development credit	(23,000)	(29,000)
Change in valuation allowance	440,000	51,000
Change in tax law allowing NOL carryback claim	(217,000)
Prior year true-ups and other	(1,000)	9,000
Income Tax Expense (Benefit), Total	$ (210,000)	$ (172,000)