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Note 22 - Segment Information (Details Textual)
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Number of Operating Segments 2    
Revenues $ 82,294,000 $ 91,797,000  
International Operation [Member]      
Revenues 22,874,000 11,706,000  
Export Sales 12,068,000 21,010,000  
Long-Lived Assets 6,659,000 6,787,000  
Net Assets 5,327,000 9,016,000  
Intersegment Eliminations [Member]      
Revenues $ 0 $ 0 $ 0