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Note 8 - Notes Payable (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
May 04, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Gain (Loss) on Extinguishment of Debt, Total   $ 1,616,000 $ (0) $ 1,270,000 $ (0)  
Notes Payable, Current, Total   0   0   $ 918,000
Notes Payable, Noncurrent, Total   0   0   653,000
PPP Loan [Member]            
Proceeds from Notes Payable, Total $ 1,571,000          
Gain (Loss) on Extinguishment of Debt, Total   1,571,000   1,571,000    
Gains Losses on Extinguishment of Accrued Interest   $ 10,000   $ 10,000    
Notes Payable, Current, Total           918,000
Notes Payable, Noncurrent, Total           $ 653,000