BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2011
Changes in the reserve for product warranty claims
Warranty reserve at beginning of the year	$ 372,000	$ 341,000
Provision	579,000	255,000
Warranty expenditures	(411,000)	(215,000)
Effect of foreign currency translation	11,000	(9,000)
Warranty reserve at end of year	551,000	372,000
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
Accrued Liabilities
Compensation and fringe benefits	4,230,000	6,525,000
Warranty reserve	551,000	372,000
Other accrued expenses	1,145,000	945,000
Accrued liabilities	$ 5,926,000	$ 7,842,000
Basic and Diluted Income per Share from Continuing Operations
Dilutive effect of outstanding stock option awards (in shares)	0	138,000
Minimum
Warranty
Warranty period	12 months
Maximum
Warranty
Warranty period	18 months
Warranty period for majority of products	12 months