Annual report pursuant to Section 13 and 15(d)

Note 2 - Summary of Significant Accounting Policies - Customer Contract Liabilities (Details)

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Note 2 - Summary of Significant Accounting Policies - Customer Contract Liabilities (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Customer contract liabilities $ 17,000 $ 108,000
Change in customer contract liabilities (91,000)  
Marketing Programs [Member]    
Customer contract liabilities 17,000 $ 108,000
Change in customer contract liabilities $ (91,000)