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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2021
INCOME TAXES |
Schedule of components of the provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Years ended December 31, |  | 2021 |  | 2020 |  | 2019
(in thousands) |  | ​ |  |  | ​ |  |  | ​ |
Current provision: |  | ​ |  |  | ​ |  |  | ​ |
Federal | ​ | $ | 7,176 | ​ | $ | 4,741 | ​ | $ | 6,637
State | ​ |  | 346 | ​ |  | 582 | ​ |  | 202
Deferred (benefit) provision: | ​ |  | ​ | ​ |  |  | ​ |  |
Federal | ​ |  | (248) | ​ |  | (410) | ​ |  | (715)
State | ​ |  | 108 | ​ |  | 99 | ​ |  | 95
Total income tax provision | ​ | $ | 7,382 | ​ | $ | 5,012 | ​ | $ | 6,219
Schedule of reconciliation between the federal statutory rate and effective tax rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Years ended December 31, |  | 2021 |  | 2020 |  | 2019 |
Federal statutory rate |  | 21.0 | % | 21.0 | % | 21.0 | %
State income taxes, net of federal benefit |  | 0.9 |  | 1.4 |  | 1.0 |
Research and experimentation credit |  | (0.9) |  | (1.5) |  | (1.2) |
Non-deductible expenses | ​ | (0.8) | ​ | 0.1 | ​ | (0.7) | ​
Change in contingencies |  | 0.4 |  | 0.1 |  | (0.1) |
Adjustments related to vesting of restricted stock |  | (1.0) |  | (1.5) |  | (1.5) |
Other |  | 0.7 |  | 0.9 |  | (0.5) |
Effective tax rate |  | 20.3 | % | 20.5 | % | 18.0 | %
Schedule of components of deferred tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | 2021 |  | 2020
(in thousands) |  | ​ |  |  | ​ |
Deferred tax assets: |  | ​ |  |  | ​ |
Warranty costs | ​ | $ | 1,021 | ​ | $ | 1,107
Sales incentives and discounts | ​ |  | 83 | ​ |  | 278
Stock-based compensation | ​ |  | 780 | ​ |  | 717
Pension | ​ |  | 3,196 | ​ |  | 2,365
State NOL’s | ​ | ​ | 283 | ​ | ​ | 423
State credits | ​ | ​ | — | ​ | ​ | 1,818
All others | ​ |  | 506 | ​ |  | 635
Valuation allowance | ​ |  | — | ​ |  | (1,818)
Total deferred tax assets | ​ |  | 5,869 | ​ |  | 5,525
Deferred tax liabilities: | ​ |  |  | ​ |  |
Depreciation and amortization expense | ​ |  | (1,033) | ​ |  | (965)
Basis differences in joint venture | ​ |  | (444) | ​ |  | (485)
Net deferred tax assets | ​ | $ | 4,392 | ​ | $ | 4,075
Schedule of unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2021 |  | 2020
Balance at January 1 | ​ | $ | 401 | ​ | $ | 358
Additions based on tax positions related to the current year | ​ |  | 32 | ​ |  | 34
Additions for tax positions of prior years | ​ |  | 106 | ​ |  | 9
Balance at December 31 | ​ | $ | 539 | ​ | $ | 401

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