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Note 11 - Financial Information About Geographic Areas - Consolidated Net Sales and Long-lived Asset Information by Geographic Area (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Revenues $ 14,251,000 $ 16,053,000 $ 44,023,000 $ 45,967,000  
Reportable Geographical Components [Member]          
Long-lived assets 7,216,000   7,216,000   $ 5,587,000
UNITED STATES | Reportable Geographical Components [Member]          
Revenues 14,124,000 15,928,000 43,551,000 45,682,000  
Long-lived assets 6,062,000   6,062,000   4,340,000
International Member | Reportable Geographical Components [Member]          
Revenues 127,000 $ 125,000 472,000 $ 285,000  
Long-lived assets $ 1,154,000   $ 1,154,000   $ 1,247,000