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INCOME TAXES (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Components of income tax expense |  |  |  |
Current taxes - Federal |  |  | $ (124,000) | $ 240,000
Current taxes - State |  |  | 10,000 | 10,000
Current taxes - Foreign |  |  | 49,000 | (13,000)
Deferred taxes - Federal |  |  | 176,000 | (167,000)
Deferred taxes - State |  |  | 239,000 | 10,000
Deferred taxes - Foreign |  |  | 25,000 | (45,000)
Income tax expense |  |  | 375,000 | 35,000
Reconciliation of federal income taxes and reported income taxes |  |  |  |
Statutory federal tax provision (benefit) |  |  | (704,000) | 27,000
State income tax benefit |  |  | (117,000) | (32,000)
Effect of foreign operations |  |  | (88,000) | 107,000
Uncertain tax positions |  |  |  | 2,000
Income tax credits |  |  | (112,000) | (134,000)
Valuation allowance |  |  | 1,011,000 | 49,000
Permanent differences |  |  | 8,000 | 16,000
Loss of Section 199 due to carryback claim |  |  | 46,000 |
Effects of tax reforms |  |  | 280,000 |
Other |  |  | 51,000 |
Income tax expense |  |  | 375,000 | 35,000
Income (loss) from operations before income taxes |  |  |  |
Domestic |  |  | (2,831,433) | 486,425
Foreign |  |  | 760,658 | (407,651)
Income (Loss) before income taxes |  |  | (2,070,775) | 78,774
Components of deferred tax assets (liabilities) |  |  |  |
Allowance for uncollectable accounts | $ 49,000 |  | 49,000 | 317,000
Inventories reserve | 198,000 |  | 198,000 | 242,000
Accrued vacation | 194,000 |  | 194,000 | 362,000
Amortization | 191,000 |  | 191,000 | 56,000
Stock-based compensation and equity appreciation rights | 23,000 |  | 23,000 | 29,000
Net operating loss carryforwards | 359,000 |  | 359,000 | 134,000
Tax credit carryforwards | 613,000 |  | 613,000 | 242,000
Other | 23,720 |  | 23,720 | 188,000
Deferred tax assets before valuation allowance | 1,650,720 |  | 1,650,720 | 1,570,000
Valuation allowance | (1,146,000) |  | (1,146,000) | (135,000)
Deferred tax assets | 504,720 |  | 504,720 | 1,435,000
Prepaid expenses | (165,000) |  | (165,000) | (323,000)
Property and equipment | (319,000) |  | (319,000) | (569,000)
Deferred tax liabilities | (484,000) |  | (484,000) | (892,000)
Net deferred tax assets | 20,720 |  | 20,720 | 543,000
Valuation allowance on foreign assets | 0 |  | 0 |
Changes in total gross unrecognized tax benefit liabilities, excluding accrued interest |  |  |  |
Balance at the beginning of the period |  | $ 52,000 | 52,000 | 51,000
Additions based on tax positions related to the current year |  |  | 22,000 | 15,000
Additions based on tax positions related to a prior year |  |  |  | 5,000
Reductions based on tax positions related to a prior year |  |  |  | (6,000)
Statute of limitations |  |  | (22,000) | (13,000)
Balance at the end of the period | 52,000 |  | $ 52,000 | $ 52,000
Effective corporate tax rate |  |  | 34.00% |
Estimated income tax provision due to impact of the Tax Act | 280,000 |  |  |
Provisional amount of net deferred tax | 223,000 |  |  |
Provisional amount of transition tax | 57,000 |  |  |
Provisional transition tax rate (in percent) |  |  | 8.00% |
Federal |  |  |  |
Operating loss carryforwards |  |  |  |
Net operating loss carryforwards | 948,000 |  | $ 948,000 |
Federal | General business |  |  |  |
Tax credit carryforwards |  |  |  |
Tax credit carryforwards | 404,000 |  | 404,000 |
Minnesota | State |  |  |  |
Operating loss carryforwards |  |  |  |
Net operating loss carryforwards | 1,144,000 |  | 1,144,000 |
Minnesota | State | R&D |  |  |  |
Tax credit carryforwards |  |  |  |
Tax credit carryforwards | 330,000 |  | 330,000 |
Iowa | State |  |  |  |
Operating loss carryforwards |  |  |  |
Net operating loss carryforwards | 357,000 |  | 357,000 |
Montana | State |  |  |  |
Operating loss carryforwards |  |  |  |
Net operating loss carryforwards | 21,000 |  | 21,000 |
Wisconsin | State |  |  |  |
Operating loss carryforwards |  |  |  |
Net operating loss carryforwards | $ 669,000 |  | $ 669,000 |
Forecast |  |  |  |
Changes in total gross unrecognized tax benefit liabilities, excluding accrued interest |  |  |  |
Effective corporate tax rate |  | 21.00% |  |

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