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Note 8 - Line of Credit (Details Textual) - Revolving Credit Facility [Member] - USD ($)
$ in Thousands
Jul. 01, 2023
May 01, 2023
May 31, 2020
Massachusetts Business Development Corporation [Member]      
Line of Credit Facility, Maximum Borrowing Capacity     $ 3,000
Long-term Line of Credit, Total $ 0    
Line of Credit Facility, Remaining Borrowing Capacity $ 3,000    
Rockland Trust Company [Member]      
Line of Credit Facility, Maximum Borrowing Capacity   $ 3,000