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BUSINESS SEGMENT AND GEOGRAPHIC INFORMATION (Details 1) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues $ 24,593 $ 27,284 $ 48,068 $ 52,340
United States [Member]        
Revenues 16,141 16,792 32,126 33,167
Canada [Member]        
Revenues $ 8,452 $ 10,492 $ 15,942 $ 19,173