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Income Taxes (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Components of income tax expense |  |
Current taxes - Federal | $ 240,000 | $ (297,000)
Current taxes - State | 10,000 | 6,000
Current taxes - Foreign | (13,000) | 29,000
Deferred taxes - Federal | (167,000) | (107,000)
Deferred taxes - State | 10,000 | 53,000
Deferred taxes - Foreign | (45,000) |
Income tax expense (benefit) | 35,000 | (316,000)
Reconciliation of federal income taxes and reported income taxes |  |
Statutory federal tax provision (benefit) | 27,000 | (302,000)
State income taxes | (32,000) | 3,000
Effect of foreign operations | 107,000 | (5,000)
Uncertain tax positions | 2,000 | (3,000)
Income tax credits | (134,000) | (125,000)
Valuation allowance | 49,000 | 86,000
Permanent differences | 16,000 | 30,000
Income tax expense (benefit) | 35,000 | (316,000)
Income (loss) from operations before income taxes |  |
Domestic | 486,425 | (968,793)
Foreign | (407,651) | 81,371
Income (Loss) Before Income Taxes | 78,774 | (887,422)
Components of deferred tax assets (liabilities) |  |
Allowance for uncollectable accounts | 317,000 | 115,000
Inventories reserve | 242,000 | 270,000
Accrued vacation | 362,000 | 360,000
Non-compete amortization | 56,000 | 191,000
Stock-based compensation and equity appreciation rights | 29,000 | 111,000
Net operating loss carryforwards | 134,000 | 113,000
Tax credit carryforwards | 242,000 | 231,000
Other | 188,000 | 180,000
Deferred tax assets before valuation allowance | 1,570,000 | 1,571,000
Valuation allowance | (135,000) | (86,000)
Deferred tax assets | 1,435,000 | 1,485,000
Prepaid expenses | (323,000) | (481,000)
Property and equipment | (569,000) | (663,000)
Deferred tax liabilities | (892,000) | (1,144,000)
Net deferred tax assets | 543,000 | 341,000
Changes in total gross unrecognized tax benefit liabilities, excluding accrued interest |  |
Balance at the beginning of the period | 51,000 | 56,000
Additions based on tax positions related to the current year | 15,000 | 12,000
Additions based on tax positions related to a prior year | 5,000 | 2,000
Reductions based on tax positions related to a prior year | 6,000 | 9,000
Statute of limitations | (13,000) | (10,000)
Balance at the end of the period | $ 52,000 | $ 51,000

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