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Note 8 - Revolving Lines of Credit (Details Textual) - USD ($)
Apr. 16, 2021
Dec. 20, 2005
Mar. 31, 2022
Dec. 31, 2021
Apr. 07, 2021
Summit Community Bank [Member] | Term Loan [Member]          
Debt Instrument, Face Amount $ 1,000,000        
Debt Instrument, Term (Year) 2 years        
Debt Instrument, Interest Rate, Stated Percentage 4.89%        
Short-Term Debt, Total         $ 150,000
Revolving Credit Facility [Member] | Summit Community Bank [Member]          
Line of Credit Facility, Maximum Borrowing Capacity $ 1,000,000        
Debt Instrument, Interest Rate, Effective Percentage 3.25%        
Long-Term Line of Credit, Total     $ 0 $ 0  
Revolving Credit Facility [Member] | TD Bank [Member]          
Line of Credit Facility, Maximum Borrowing Capacity   $ 1,000,000      
Revolving Credit Facility [Member] | TD Bank [Member] | London Interbank Offered Rate (LIBOR) Swap Rate [Member]          
Debt Instrument, Basis Spread on Variable Rate   3.50%      
Revolving Credit Facility [Member] | TD Bank [Member] | London Interbank Offered Rate (LIBOR) Swap Rate [Member] | Minimum [Member]          
Debt Instrument, Basis Spread on Variable Rate   4.00%