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Note 9 - Lease Commitments (Details Textual)
1 Months Ended 3 Months Ended
Jan. 31, 2024
USD ($)
ft²
Mar. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Operating Lease, Impairment Loss   $ 0  
Operating Lease, Right-of-Use Asset   522,000 $ 461,000
Operating Lease, Liability   522,000  
Nashua, NH Office Lease [Member]      
Lessee, Operating Lease, Term of Contract (Month) 36 months    
Area of Real Estate Property (Square Foot) | ft² 3,000    
Operating Lease, Expense $ 46,000    
Operating Lease, Right-of-Use Asset   100,000  
Operating Lease, Liability   $ 100,000