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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Provisions for Income Taxes | The provisions for income taxes are:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 5,641 |  |  | $ | 2,124 |  |  | $ | 5,136 |
State |  |  | 1,777 |  |  |  | 1,347 |  |  |  | (122 | )
Foreign |  |  | 2,121 |  |  |  | 570 |  |  |  | 655 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 650 |  |  |  | 160 |  |  |  | (1,345 | )
State |  |  | (365 | ) |  |  | 242 |  |  |  | 1,216 |
Foreign |  |  | (679 | ) |  |  | — |  |  |  | — |
|  | $ | 9,145 |  |  | $ | 4,443 |  |  | $ | 5,540 |
Total Income Tax Expense Applying U.S. Federal Income Tax Rate | Total income tax expense differed from the amounts computed by applying the U.S. Federal income tax rate of 21.0% to income before income tax expense as a result of the following:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Computed tax expense at statutory federal rates |  | $ | 7,054 |  |  | $ | 8,651 |  |  | $ | 6,415 |
Increase (decrease) in taxes resulting from: |  |  |  |  |  |  |  |  |  |  |  |
State taxes, net of federal income tax benefit |  |  | 1,627 |  |  |  | 988 |  |  |  | 820 |
Domestic production deduction |  |  | — |  |  |  | (150 | ) |  |  | (1,272 | )
Impact of the enactment of the Tax Cuts and Jobs Act (net) |  |  | 1,089 |  |  |  | (3,433 | ) |  |  | — |
Income tax credits |  |  | (689 | ) |  |  | (431 | ) |  |  | (335 | )
Foreign tax rate differential |  |  | (37 | ) |  |  | (1,503 | ) |  |  | (1,587 | )
Subpart F income |  |  | 14 |  |  |  | 3 |  |  |  | 14 |
(Gain) loss on equity investments |  |  | (61 | ) |  |  | 62 |  |  |  | 123 |
Stock based compensation |  |  | 277 |  |  |  | 262 |  |  |  | 208 |
Tax interest |  |  | — |  |  |  | (22 | ) |  |  | 920 |
Other |  |  | (129 | ) |  |  | 16 |  |  |  | 234 |
|  | $ | 9,145 |  |  | $ | 4,443 |  |  | $ | 5,540 |
Components of Income before Provision | Income before provision for income taxes and losses on equity investments are:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Domestic |  | $ | 26,124 |  |  | $ | 18,931 |  |  | $ | 12,513 |
Foreign |  |  | 7,472 |  |  |  | 5,922 |  |  |  | 6,404 |
|  | $ | 33,596 |  |  | $ | 24,853 |  |  | $ | 18,917 |
Deferred Tax Assets and Liability | Temporary differences between the financial statement carrying amounts and tax bases of assets and liabilities that give rise to significant portions of the net deferred tax liability at December 31, 2018 and 2017 relate to the following:
|  | 2018 |  |  | 2017 |
Deferred tax asset |  |  |  |  |  |  |  |
Inventories |  | $ | 3,299 |  |  | $ | 3,213 |
State income taxes |  |  | 53 |  |  |  | 330 |
Program accrual |  |  | 7,088 |  |  |  | 7,381 |
Vacation pay accrual |  |  | 685 |  |  |  | 600 |
Accrued bonuses |  |  | 1,246 |  |  |  | 1,073 |
Bad debt expense |  |  | 294 |  |  |  | 12 |
Stock compensation |  |  | 1,723 |  |  |  | 822 |
NOL carryforward |  |  | 580 |  |  |  | 54 |
Tax credits |  |  | 779 |  |  |  | 778 |
Other |  |  | 266 |  |  |  | 381 |
Deferred tax asset |  | $ | 16,013 |  |  | $ | 14,644 |
Deferred tax liability |  |  |  |  |  |  |  |
Plant and equipment, principally due to differences in depreciation and capitalized interest |  | $ | 30,269 |  |  | $ | 29,986 |
Prepaid expenses |  |  | 1,107 |  |  |  | 942 |
Deferred tax liability |  |  | 31,376 |  |  |  | 30,928 |
Total net deferred tax liability |  | $ | 15,363 |  |  | $ | 16,284 |
Gross Unrecognized Tax Liabilities | The following is a roll-forward of the Company’s total gross unrecognized tax liabilities, not including interest and penalties, for the years ended December 31, 2018 and 2017:
|  | 2018 |  |  | 2017 |
Balance at beginning of year |  | $ | 2,118 |  |  | $ | 1,893 |
Additions for tax positions related to the current year |  |  | 128 |  |  |  | 77 |
Additions for tax positions related to the prior years |  |  | 24 |  |  |  | — |
Additions for tax positions related to acquired businesses |  |  | — |  |  |  | 1,766 |
Reduction for tax positions related to the prior years |  |  | (100 | ) |  |  | (1,618 | )
Balance at end of year |  | $ | 2,170 |  |  | $ | 2,118 |

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