13. SHAREHOLDERS' EQUITY - Reconciliation of the numerators and denominators (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stockholders' Equity Note [Abstract]
Basic earnings per share, Net Income (in dollars)	$ 3,198	$ 6,404	$ 5,268
Basic earnings per share, Weighted Average Number of Shares Outstanding (in shares)	6,349	6,747	7,561
Basic earnings per share (in dollars per share)	$ 0.50	$ 0.95	$ 0.70
Effect of dilutive stock-based compensation	78	36	18
Diluted earnings per share, Net Income (in dollars)	$ 3,198	$ 6,404	$ 5,268
Diluted earnings per share, Weighted Average Number of Shares Outstanding (in shares)	6,427	6,783	7,579
Diluted earnings per share (in dollars per share)	$ 0.50	$ 0.94	$ 0.70