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Note 20 - Segment Information (Details Textual)
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Number of Operating Segments 2  
Revenue from Contract with Customer, Including Assessed Tax $ 97,434,000 $ 82,346,000
International Operation [Member]    
Export Sales 4,463,000 3,423,000
Revenues, Total 47,077,000 29,812,000
Long-Lived Assets 7,083,000 5,819,000
Net Assets, Ending Balance 16,336,000 $ 14,344,000
Intersegment Eliminations [Member]    
Revenue from Contract with Customer, Including Assessed Tax $ 0