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Note 3 - Revenue From Contracts With Customers (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Contract with Customer, Liability $ 735,000   $ 735,000   $ 970,000
Contract with Customer, Liability, Revenue Recognized $ 82,000 $ 51,000 $ 404,000 $ 482,000  
Minimum [Member]          
Capitalized Contract Cost, Amortization Period (Month) 12 months   12 months    
Maximum [Member]          
Capitalized Contract Cost, Amortization Period (Month) 60 months   60 months