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Note 9 - Line of Credit (Details Textual) - Massachusetts Business Development Corporation [Member] - Revolving Credit Facility [Member] - USD ($)
$ in Thousands
1 Months Ended
Sep. 30, 2019
May 31, 2021
Sep. 30, 2019
Jun. 26, 2021
May 31, 2020
Line of Credit Facility, Maximum Borrowing Capacity $ 2,500   $ 2,500   $ 3,000
Debt Instrument, Termination Period (Year) 3 years        
Long-term Line of Credit, Total       $ 0  
Line of Credit Facility, Remaining Borrowing Capacity       $ 3,000  
London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate   5.50% 6.50%