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Note 11 - Related Party Transactions (Details Textual) - USD ($)
1 Months Ended 9 Months Ended
Jan. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Jul. 01, 2019
Dec. 31, 2018
Due to Related Parties, Noncurrent, Total   $ 1,100,000     $ 1,600,000
Interest Expense, Related Party   49,000 $ 46,000    
Conversion of Related Party Debt to Equity [Member]          
Debt Conversion, Original Debt, Amount $ 600,000        
Schwan Incorporated [Member]          
Related Party Transaction, Amounts of Transaction   2,700 12,000    
Accounts Payable, Related Parties   8,800      
CTI Europe [Member]          
Long-term Debt, Gross   20,000 $ 12,000    
Board of Directors Chairman [Member]          
Due from Related Parties, Total       $ 1,387,000  
Note Receivable, Reserve   350,000      
Notes Receivable, Related Parties   $ 1,026,813