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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Revenues $ 16,289,000 $ 16,115,000 $ 29,772,000 $ 29,914,000  
Reportable Geographical Components [Member]          
Long-lived assets 5,314,000   5,314,000   $ 5,587,000
UNITED STATES | Reportable Geographical Components [Member]          
Revenues 16,128,000 16,061,000 29,427,000 29,754,000  
Long-lived assets 4,148,000   4,148,000   4,340,000
International Member | Reportable Geographical Components [Member]          
Revenues 161,000 $ 54,000 345,000 $ 160,000  
Long-lived assets $ 1,166,000   $ 1,166,000   $ 1,247,000