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Note 13 - Related Party Transactions (Details Textual) - USD ($)
1 Months Ended 9 Months Ended
Apr. 12, 2021
Apr. 30, 2021
Apr. 30, 2019
Dec. 31, 2021
Dec. 31, 2020
Mar. 31, 2021
Interest Paid, Excluding Capitalized Interest, Operating Activities       $ 268,000 $ 344,000  
Long-term Debt, Total       5,145,000    
Long-term Debt, Current Maturities, Total       626,000   $ 2,210,000
Long-term Debt, Excluding Current Maturities, Total       4,400,000   4,823,000
Conversion of Skywords Note Into Revolving Loans [Member]            
Debt Conversion, Original Debt, Amount $ 500,000          
Skywords Note [Member]            
Repayments of Long-term Debt, Total 500,000 $ 500,000        
Interest Paid, Excluding Capitalized Interest, Operating Activities 1,900 1,900        
Skywords Note [Member] | Unsecured Subordinated Loan [Member]            
Debt Instrument, Face Amount     $ 1,500,000      
Long-term Debt, Total       $ 1,000,000   1,500,000
Long-term Debt, Current Maturities, Total   $ 500,000       500,000
Long-term Debt, Excluding Current Maturities, Total           $ 1,000,000
Skywords Note [Member] | Unsecured Subordinated Loan [Member] | Prime Rate [Member]            
Debt Instrument, Basis Spread on Variable Rate     1.00%      
Skywords Amended Note [Member]            
Debt Instrument, Face Amount $ 500,000          
Debt Instrument, Term (Year) 3 years          
Debt Instrument, Floor Interest Rate 5.00% 5.00%        
Skywords Amended Note [Member] | Prime Rate [Member]            
Debt Instrument, Basis Spread on Variable Rate 1.00%