BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Warranty, Accrued Liabilities, and Basic and Diluted Income per Share (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Changes in the reserve for product warranty claims
Warranty reserve at beginning of the year	$ 780	$ 786	$ 629
Warranty reserves acquired	297
Provision	(138)	142	234
Warranty expenditures	(96)	(123)	(40)
Effect of foreign currency translation	(13)	(25)	(37)
Warranty reserve at end of year	830	780	786
Accrued Liabilities
Compensation and fringe benefits				$ 7,379	$ 7,791
Warranty reserve	$ 780	$ 786	$ 629	830	780
Other accrued expenses				2,469	2,550
Accrued liabilities				$ 10,678	$ 11,121
Basic and Diluted Income per Share from Continuing Operations
Dilutive effect of outstanding stock option awards (in shares)	94,000	10,000	20,000
Stock awards excluded from the calculation of diluted income per share (in shares)	30,700	0	0
Minimum
Warranty
Warranty period	3 months
Maximum
Warranty
Warranty period	2 years