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EARNINGS PER SHARE - Calculation of Basic and Diluted Earnings per Share(Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 4,012	$ 3,308	$ 7,637	$ 5,310
Weighted average shares outstanding - basic (in shares)	8,094	8,069	8,088	8,064
Dilutive effect of share-based compensation (in shares)	189	139	187	139
Weighted average shares outstanding - diluted (in shares)	8,283	8,208	8,275	8,203
Per share information:
Basic earnings per share (in usd per share)	$ 0.50	$ 0.41	$ 0.94	$ 0.66
Diluted earnings per share (in usd per share)	$ 0.48	$ 0.40	$ 0.92	$ 0.65

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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