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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2019
INCOME TAXES |
Schedule of components of the provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Years ended December 31, |  | 2019 |  | 2018 |  | 2017
(in thousands) |  | ​ |  |  | ​ |  |  | ​ |
Current provision: |  | ​ |  |  | ​ |  |  | ​ |
Federal | ​ | $ | 6,637 | ​ | $ | 6,173 | ​ | $ | 8,623
State | ​ |  | 202 | ​ |  | 616 | ​ |  | 546
Deferred (benefit) provision: | ​ |  |  | ​ |  |  | ​ |  |
Federal | ​ |  | (715) | ​ |  | 384 | ​ |  | 1,511
State | ​ |  | 95 | ​ |  | (6) | ​ |  | 8
Total income tax provision | ​ | $ | 6,219 | ​ | $ | 7,167 | ​ | $ | 10,688
Schedule of reconciliation between the federal statutory rate and effective tax rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Years ended December 31, |  | 2019 |  | 2018 |  | 2017 |
Federal statutory rate |  | 21.0 | % | 21.0 | % | 35.0 | %
State income taxes, net of federal benefit |  | 1.0 |  | 1.5 |  | 1.1 |
Research and experimentation credit |  | (1.2) |  | (0.8) |  | (0.8) |
Non-deductible expenses | ​ | (0.7) | ​ | 0.4 | ​ | (3.5) | ​
Change in contingencies |  | (0.1) |  | 0.4 |  | 0.5 |
Adjustments related to the Act |  | 0.0 |  | (0.3) |  | 5.6 |
Adjustments related to vesting of restricted stock |  | (1.5) |  | (1.8) |  | (2.4) |
Other |  | (0.5) |  | (0.3) |  | 0.1 |
Effective tax rate |  | 18.0 | % | 20.1 | % | 35.6 | %
Schedule of components of deferred tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | 2019 |  | 2018
(in thousands) |  | ​ |  |  | ​ |
Deferred tax assets: |  | ​ |  |  | ​ |
Warranty costs | ​ | $ | 1,190 | ​ | $ | 1,233
Sales incentives and discounts | ​ |  | 404 | ​ |  | 317
Stock-based compensation | ​ |  | 696 | ​ |  | 667
Pension | ​ |  | 2,002 | ​ |  | 1,337
State NOL’s | ​ | ​ | 484 | ​ | ​ | 588
State credits | ​ | ​ | 1,818 | ​ | ​ | 2,794
All others | ​ |  | 560 | ​ |  | 559
Valuation allowance | ​ |  | (1,818) | ​ |  | (2,794)
Total deferred tax assets | ​ |  | 5,336 | ​ |  | 4,701
Deferred tax liabilities: | ​ |  |  | ​ |  |
Depreciation and amortization expense | ​ |  | (947) | ​ |  | (1,009)
Basis differences in joint venture | ​ |  | (399) | ​ |  | (367)
Net deferred tax assets | ​ | $ | 3,990 | ​ | $ | 3,325
Schedule of unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
Balance at January 1 | ​ | $ | 393,000 | ​ | $ | 243,000
(Decreases) additions based on tax positions related to the current year | ​ |  | (28,000) | ​ |  | 81,000
(Decreases) additions for tax positions of prior years | ​ |  | (7,000) | ​ |  | 69,000
Balance at December 31 | ​ | $ | 358,000 | ​ | $ | 393,000

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