Note 2 - Summary of Significant Accounting Policies - Customer Contract Liabilities (Details) - USD ($)	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Customer contract liabilities		$ 108,000
Change in customer contract liabilities	(108,000)
Marketing Programs [Member]
Customer contract liabilities	0	$ 108,000
Change in customer contract liabilities	$ (108,000)