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Income Taxes (Income Taxes Included in The Balance Sheet) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred tax assets: |  |  |
Allowance for doubtful accounts |  | $ 184 | $ 136
Accrued warranty |  | 87 | 114
Unearned revenue |  | 165 | 125
Accrued expenses |  | 493 | 448
Net operating losses (NOL) and tax credit carryforwards |  | 6,823 | 3,761
Other temporary differences | [1] | 197 | 334
Total gross deferred tax assets |  | 7,949 | 4,918
Valuation allowance |  | (3,087) | (2,953)
Deferred tax asset, net of valuation allowance |  | 4,862 | 1,965
Deferred tax liability: |  |  |
Property, plant and equipment |  | (240) | $ (216)
Undistributed earnings |  | (490) |
Net deferred tax assets |  | $ 4,132 | $ 1,749
[1] | Other temporary differences primarily relate to research and development expenses

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