Note 2 - Summary of Significant Accounting Policies - Customer Contract Liabilities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Customer contract liabilities	$ 7,000	$ 17,000
Change in customer contract liabilities		(10,000)
Marketing Programs [Member]
Customer contract liabilities	7,000	$ 17,000
Change in customer contract liabilities	$ (10,000)