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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