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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 |  |  |

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