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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2016
Income Tax Disclosure [Abstract] |
Schedule of income before income tax, domestic and foreign |
|  | 2016 |  |  | 2015 |  |  | 2014 |
United States |  | $ | 25,038 |  |  | $ | 19,850 |  |  | $ | 18,703 |
Foreign |  |  | 6,039 |  |  |  | 5,013 |  |  |  | 4,795 |
Total |  | $ | 31,077 |  |  | $ | 24,863 |  |  | $ | 23,498 |
Schedule of provision for income taxes |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 5,016 |  |  | $ | 5,778 |  |  | $ | 5,953 |
State |  |  | 955 |  |  |  | 913 |  |  |  | 707 |
Foreign |  |  | 1,965 |  |  |  | 1,623 |  |  |  | 1,853 |
|  |  | 7,936 |  |  |  | 8,314 |  |  |  | 8,513 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 3,057 |  |  |  | 548 |  |  |  | 283 |
State |  |  | 205 |  |  |  | 47 |  |  |  | 32 |
Foreign |  |  | (43 | ) |  |  | (22 | ) |  |  | (168 | )
|  |  | 3,219 |  |  |  | 573 |  |  |  | 147 |
|  | $ | 11,155 |  |  | $ | 8,887 |  |  | $ | 8,660 |
Schedule of effective income tax rate reconciliation |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Federal statutory tax rate |  |  | 35.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
State taxes, net of federal tax benefit |  |  | 3.8 | % |  |  | 3.0 | % |  |  | 3.7 | %
Excess of (decreases in) foreign tax over US tax on foreign income |  |  | (0.5 | )% |  |  | (1.1 | )% |  |  | 0.1 | %
Domestic tax credits |  |  | (2.7 | )% |  |  | (1.2 | )% |  |  | (1.4 | )%
Other |  |  | 0.2 | % |  |  | — |  |  |  | (0.5 | )%
Effective tax rate |  |  | 35.8 | % |  |  | 35.7 | % |  |  | 36.9 | %
Schedule of deferred income tax assets and liabilities |
|  | 2016 |  |  | 2015 |
Deferred tax assets: |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 58 |  |  | $ | 78 |
Accruals and reserves |  |  | 2,552 |  |  |  | 3,468 |
Other |  |  | 222 |  |  |  | 179 |
Total deferred tax assets |  |  | 2,832 |  |  |  | 3,725 |
Deferred tax liabilities: |  |  |  |  |  |  |  |
Property, plant, and equipment |  |  | 3,610 |  |  |  | 2,499 |
Investments in foreign subsidiaries |  |  | 1,215 |  |  |  | — |
Total deferred tax liabilities |  |  | 4,825 |  |  |  | 2,499 |
Net deferred tax asset/(liability) |  | $ | (1,993 | ) |  | $ | 1,226 |
Schedule of activity of the unrecognized tax benefits |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Unrecognized tax benefits – January 1 |  |  | 792 |  |  |  | 526 |  |  |  | 344 |
Gross increases – tax positions in prior period |  |  | 245 |  |  |  | 266 |  |  |  | 182 |
Unrecognized tax benefits – December 31 |  | $ | 1,037 |  |  | $ | 792 |  |  | $ | 526 |

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