BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)	0 Months Ended	12 Months Ended
	Oct. 31, 2014	Dec. 31, 2014 item	Dec. 31, 2013 item	Dec. 31, 2012
BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Number of reporting units		1
Goodwill impairment	$ 0
Changes in the reserve for product warranty claims
Warranty reserve at beginning of the year		629,000	551,000
Warranty reserves acquired			429,000
Provision		234,000	175,000
Warranty expenditures		(40,000)	(529,000)
Effect of foreign currency translation		(37,000)	3,000
Warranty reserve at end of year		786,000	629,000	551,000
Expected costs of replacing certain products in the field due to an incorrect electronic component in a printed circuit board				342,000
Number of Company's sub-contract suppliers who supplied an incorrect electronic component			1
Additional provision recorded to replace certain products in the field due to an incorrect electronic component in a printed circuit board			44,000
Warranty expenditures incurred related to replacing certain products in the field due to an incorrect electronic component in a printed circuit board			367,000
Reserve, net of the effect of foreign currency translation related to replacing certain products in the field due to an incorrect electronic component in a printed circuit board		0	30,000
Accrued Liabilities
Compensation and fringe benefits		9,696,000	6,721,000
Warranty reserve		786,000	629,000	551,000
Other accrued expenses		1,848,000	2,548,000
Accrued liabilities		$ 12,330,000	$ 9,898,000
Basic and Diluted Income per Share from Continuing Operations
Dilutive effect of outstanding stock option awards (in shares)		20,000	7,000
Stock awards excluded from the calculation of diluted income per share (in shares)		0	0