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Income Taxes (Income Taxes Included in The Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Allowance for doubtful accounts | $ 81 | $ 92
Inventory write-down | 267 | 376
Unearned revenue | 275 | 63
Accrued expenses | 441 | 367
Net operating losses (NOL) and tax credit carryforwards | 1,904 | 4,218
Other temporary differences | 138 | 113
Total gross deferred tax assets | 3,106 | 5,229
Valuation allowance |  | (496)
Deferred tax asset, net of valuation allowance | 3,106 | 4,733
Deferred tax liabilities: |  |
Property, plant and equipment | (231) | (242)
Undistributed earnings | (509) | (424)
Deferred tax liabilities | (740) | (666)
Net deferred tax assets | $ 2,366 | $ 4,067

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