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C. EARNINGS PER SHARE - (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator:                      
Net income $ 14,225 $ 17,736 $ 603 $ (1,330) $ 2,679 $ 2,700 $ 6,089 $ (675) $ 31,234 $ 10,793 $ 4,283
Weighted average shares used to compute net income per share                      
Basic                 17,201,731 15,626,753 14,307,477
Effective of dilutive options, restricted stock units and warrants                 511,000 906,000 880,000
Weighted average shares used to compute net income per share: Diluted                 17,712,928 16,532,850 15,186,961
Net income per share                      
Basic $ 0.81 $ 1.03 $ 0.04 $ (0.08) $ 0.16 $ 0.17 $ 0.41 $ (0.05) $ 1.82 $ 0.69 $ 0.30
Diluted $ 0.77 $ 0.97 $ 0.03 $ (0.08) $ 0.15 $ 0.16 $ 0.38 $ (0.05) $ 1.76 $ 0.65 $ 0.28