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Note 8 - Bank Debt (Details Textual) - USD ($)
6 Months Ended
Jul. 05, 2018
Jun. 30, 2021
Dec. 31, 2021
Mar. 02, 2021
Dec. 31, 2020
Sep. 30, 2019
Line of Credit Facility, Maximum Borrowing Capacity     $ 13,700,000   $ 9,200,000  
J P Morgan Chase Bank [Member] | Term Debt [Member]            
Long-term Debt, Total       $ 6,000,000    
Debt Instrument, Periodic Payment, Total   $ 111,111        
J P Morgan Chase Bank [Member] | Term Debt [Member] | Prime Rate [Member]            
Debt Instrument, Basis Spread on Variable Rate 0.25%          
J P Morgan Chase Bank [Member] | Term Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate 2.25%          
J P Morgan Chase Bank [Member] | Revolving Credit Facility [Member]            
Line of Credit Facility, Maximum Borrowing Capacity $ 12,000,000     $ 30,000,000   $ 20,000,000
Line of Credit Facility, Percent of Eligible Accounts 80.00%          
Line of Credit Facility, Percent of Eligible Progress Billing Accounts 50.00%          
Line of Credit Facility, Percent of Eligible Inventory 50.00%          
Line of Credit Facility, Commitment Fee Percentage 0.25%          
J P Morgan Chase Bank [Member] | Revolving Credit Facility [Member] | Prime Rate [Member]            
Debt Instrument, Basis Spread on Variable Rate 0.25%          
J P Morgan Chase Bank [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate 1.75%          
J P Morgan Chase Bank [Member] | Letter of Credit [Member]            
Line of Credit Facility, Maximum Borrowing Capacity $ 3,000,000