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Note 4 - Supplemental Disclosures of Cash Flow Information - Supplemental Disclosures of Cash Flow Information (Details) - USD ($)
 12 Months Ended
Mar. 04, 2024
Dec. 31, 2025
Dec. 31, 2024
Cash paid for interest   $ 2,411,000 $ 2,518,000
Cash paid for taxes   58,000 61,000
Increase in accounts payable and accrued expenses related to purchases of inventory   21,000 34,000
Decrease in inventory related to the transfer of property and equipment   0 (1,501,000)
Change in deposits related to inventory   (8,000) 983,000
Abandonment of financing lease   31,000 0
Contract modification resulting in a measurement of an operating lease   1,344,000 0
Settlement of ATD Holdback Shares with common stock   1,156,000 0
Fair value of shares issued in connection with the acquisition of ATD   0 8,893,000
Fair value of ATD Holdback Shares at the acquisition date   0 1,635,000
Retirement of the 2023 Promissory Notes     1,875,000
Right-of-use assets obtained in exchange for new finance lease liabilities   575,000 1,267,000
Right-of-use assets obtained in exchange for new operating lease liabilities   396,000 453,000
The 2023 Promissory Notes Converted into Common Stock [Member]      
Retirement of the 2023 Promissory Notes $ 1,875,000 0 1,875,000
Conversion of Prepaid Advance to Common Stock [Member]      
Retirement of the 2023 Promissory Notes   $ 0 $ 14,100,000