BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Warranty, Accrued Liabilities, and Basic and Diluted Income per Share (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Changes in the reserve for product warranty claims
Warranty reserve at beginning of the year	$ 1,966	$ 2,139	$ 2,160
Settlements	(632)	(272)	(296)
Warranty expenditures	343	196	243
Effect of foreign currency translation	136	(97)	32
Warranty reserve at end of year	1,813	1,966	2,139
ACCRUED LIABILITIES
Compensation and fringe benefits	20,498	13,134
Warranty reserve	1,813	1,966	2,139
Income taxes payable	1,853	1,472
Operating lease liabilities - current	$ 5,323	$ 5,088
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued liabilities	Accrued liabilities
Finance lease obligations - current	$ 486	$ 448
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued liabilities	Accrued liabilities
Contract liabilities	$ 3,767	$ 2,292
Restructuring related accruals	521
Other accrued expenses	6,629	5,821
Accrued liabilities	40,890	30,221
Restructuring and business realignment costs	3,993	1,971	1,317
Payment of restructuring charges	3,472
Costs associated with realignment	4,000
Changes in restructuring related accruals
Expenses incurred	3,993	$ 1,971	$ 1,317
Cash payments	(3,472)
Ending balance	$ 521
Basic and Diluted Income per Share
Basic weighted average shares outstanding	16,669	16,529	15,963
Dilutive effect of potential common shares	63	74	309
Diluted weighted average shares outstanding	16,732	16,603	16,272
Stock awards excluded from the calculation of diluted income per share (in shares)	29,000	106,000	22,000
Minimum
Warranty
Warranty period	3 months
Maximum
Warranty
Warranty period	2 years