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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
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Revenues $ 13,822,000 $ 13,482,000  
Reportable Geographical Components [Member]      
Long-lived assets 8,412,000   $ 8,520,000
UNITED STATES | Reportable Geographical Components [Member]      
Revenues 13,647,000 13,298,000  
Long-lived assets 7,235,000   7,325,000
International Member | Reportable Geographical Components [Member]      
Revenues 175,000 $ 184,000  
Long-lived assets $ 1,177,000   $ 1,195,000