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Supplemental Cash Flow Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Supplemental Cash Flow Information      
Interest, net $ (29,000) $ 112,000 $ 210,000
Income taxes, net of refunds 1,459,000 3,259,000 $ 4,199,000
Cashless exercises $ 36,000 $ 372,000