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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2020
INCOME TAXES |
Schedule of income before income tax, domestic and foreign | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
United States | ​ | $ | 31,183 | ​ | $ | 41,220 | ​ | $ | 34,220
Foreign | ​ |  | 6,914 | ​ |  | 9,165 | ​ |  | 7,443
Total | ​ | $ | 38,097 | ​ | $ | 50,385 | ​ | $ | 41,663
Schedule of provision for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018
Current: |  | ​ |  |  | ​ |  |  | ​ |
Federal | ​ | $ | 5,099 | ​ | $ | 6,422 | ​ | $ | 5,480
Federal – Deemed Repatriation | ​ |  | — | ​ |  | — | ​ |  | (477)
State | ​ |  | 96 | ​ |  | 53 | ​ |  | (380)
Foreign | ​ |  | 2,344 | ​ |  | 3,083 | ​ |  | 2,719
​ | ​ |  | 7,539 | ​ |  | 9,558 | ​ |  | 7,342
Deferred: | ​ |  |  | ​ |  |  | ​ |  |
Federal | ​ |  | 734 | ​ |  | 1,599 | ​ |  | 571
State | ​ |  | 9 | ​ |  | 17 | ​ |  | (55)
Foreign | ​ |  | (15) | ​ |  | 100 | ​ |  | 59
​ | ​ |  | 728 | ​ |  | 1,716 | ​ |  | 575
​ | ​ | $ | 8,267 | ​ | $ | 11,274 | ​ | $ | 7,917
Schedule of effective income tax rate reconciliation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019 |  | 2018 |
Federal statutory tax rate |  | 21.0 | % | 21.0 | % | 21.0 | %
State taxes, net of federal tax benefit |  | 0.2 | % | 0.1 | % | (0.8) | %
Excess of foreign tax over US tax on foreign income |  | 2.3 | % | 2.5 | % | 2.9 | %
Deemed repatriation tax |  | — | % | — | % | (1.1) | %
Domestic tax deductions and credits |  | (1.0) | % | (0.4) | % | (0.4) | %
Foreign Derived Intangible Income deduction |  | (0.8) | % | (1.1) | % | (1.3) | %
Other |  | — | % | 0.3 | % | (1.3) | %
Effective tax rate |  | 21.7 | % | 22.4 | % | 19.0 | %
Schedule of deferred income tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019
Deferred tax assets: |  | ​ |  |  | ​ |
Allowance for doubtful accounts | ​ | $ | 250 | ​ | $ | 212
Accruals and reserves | ​ |  | 1,768 | ​ |  | 1,902
Other | ​ |  | 218 | ​ |  | 399
Total deferred tax assets | ​ |  | 2,236 | ​ |  | 2,513
Deferred tax liabilities: | ​ |  |  | ​ | ​ |
Property, plant, and equipment | ​ |  | 6,375 | ​ |  | 5,926
Other | ​ |  | 5 | ​ |  | 3
Total deferred tax liabilities | ​ |  | 6,380 | ​ |  | 5,929
Valuation Allowance | ​ |  | — | ​ |  | —
Net deferred tax asset/(liability) | ​ | $ | (4,144) | ​ | $ | (3,416)

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