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Note 11 - Segment Information (Details Textual)
3 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Number of Reportable Segments 2  
Revenue, Net $ 51,818,000 [1] $ 48,913,000 [2]
North American Segment [Member]    
Revenue, Net 29,718,000 [1] 28,403,000 [2]
Intersegment Eliminations [Member] | North American Segment [Member]    
Revenue, Net 1,696 2,357
Intersegment Eliminations [Member] | International Segment [Member]    
Revenue, Net $ 3,390 $ 3,082
[1] Excludes $1,696 of North American segment intercompany sales to the International segment, and $3,390 of International segment intercompany sales to the North American segment.
[2] Excludes $2,357 of North American segment intercompany sales to the International segment, and $3,082 of International segment intercompany sales to the North American segment.