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Note 11 - Related Party Transactions (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Jul. 01, 2019
Jan. 01, 2019
Dec. 31, 2018
Due to Related Parties, Noncurrent, Total   $ 1,140,709   $ 1,123,769        
Due from Related Parties, Current, Total   100,000   100,000        
Series C Preferred Stock [Member]                
Stock Issued During Period, Shares, New Issues (in shares) 170,000              
Proceeds from Issuance of Preferred Stock and Preference Stock $ 1,500,000              
Schwan Incorporated [Member]                
Related Party Transaction, Amounts of Transaction   31,000 $ 0          
Accounts Payable, Related Parties   0            
John H Schwan [Member] | Promissory Note [Member]                
Due to Related Parties, Noncurrent, Total             $ 997,019 $ 1,600,000
Repayments of Related Party Debt   0     $ 0      
Interest Expense, Related Party   17,000 15,000          
CTI Europe [Member]                
Long-term Debt, Gross   0 $ 9,000          
Board of Directors Chairman [Member]                
Due from Related Parties, Current, Total   $ 100,000   100,000   $ 1,300,000    
Note Receivable, Reserve       $ 1,277,000        
LF International [Member] | Series C Preferred Stock [Member]                
Stock Issued During Period, Shares, New Issues (in shares) 170,000              
Proceeds from Issuance of Preferred Stock and Preference Stock $ 1,500,000