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INCOME TAXES - Significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax assets: |  |
Warranty costs | $ 1,254 | $ 1,021
Stock-based compensation | 866 | 780
Pension | 3,099 | 3,196
State NOL's | 221 | 283
Capitalized research and development | 1,300 |
All others, net | 789 | 589
Total deferred tax assets | 7,529 | 5,869
Deferred tax liabilities: |  |
Depreciation and amortization expense | (1,092) | (1,033)
Basis differences in joint venture | (410) | (444)
Net deferred tax assets | $ 6,027 | $ 4,392

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