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, 2023	Dec. 31, 2022	Dec. 31, 2021	Feb. 29, 2024
Changes in the reserve for product warranty claims
Warranty reserve at beginning of the year	$ 2,160	$ 1,869	$ 1,571
Warranty reserves acquired		45	15
Provision	(296)	(66)	543
Warranty expenditures	243	409	(204)
Effect of foreign currency translation	32	(97)	(56)
Warranty reserve at end of year	2,139	2,160	1,869
ACCRUED LIABILITIES
Compensation and fringe benefits	17,251	15,818
Accrued business acquisition consideration	12,638	12,500
Warranty reserve	2,139	2,160	$ 1,869
Income taxes payable	2,483	3,934
Operating lease liabilities - current	$ 5,142	$ 4,224
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued liabilities	Accrued liabilities
Finance lease obligations, current	$ 412	$ 377
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued liabilities	Accrued liabilities
Contract liabilities	$ 2,137	$ 4,807
Contingent consideration-current	7,720			$ 5,720
Other accrued expenses	6,566	4,301
Accrued liabilities	$ 56,488	$ 48,121
Basic and Diluted Income per Share
Basic weighted average shares outstanding	15,963,000	15,448,000	14,413,000
Dilutive effect of potential common shares	309,000	503,000	104,000
Diluted weighted average shares outstanding	16,272,000	15,951,000	14,517,000
Stock awards excluded from the calculation of diluted income per share (in shares)	22,000	15,000	2,000
Minimum
Warranty
Warranty period	3 months
Maximum
Warranty
Warranty period	2 years