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INCOME TAXES - Significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Warranty costs | $ 1,233 | $ 1,182
Sales incentives and discounts | 317 | 348
Stock-based compensation | 667 | 611
Pension | 1,337 | 1,406
Uniform capitalization | 44 | 47
All others | 515 | 479
State credits and NOL's | 3,382 | 6,124
Valuation allowance | (2,794) | (5,447)
Total deferred tax assets | 4,701 | 4,750
Deferred tax liabilities: |  |
Depreciation and amortization expense | (1,009) | (781)
Basis differences in joint venture | (367) | (320)
Net deferred tax assets | $ 3,325 | $ 3,649

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