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Provision For Income Taxes (Details 1) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Provision For Income Taxes Details 1 |  |  |
Federal income tax expense computed at the statutory rate | $ 1,357,000 | $ 1,428,000 | $ 2,666,000
Federal income tax expense computed at the statutory rate, percentage | 34.00% | 34.00% | 34.00%
State and local tax expense, net | $ 337,000 | $ 215,000 | $ 745,000
State and local tax expense, net, percentage | 8.40% | 5.10% | 9.50%
U.S. domestic manufacturers' deduction & other permanent differences | $ 300,000 | $ 464,000 | $ (455,000)
U.S. domestic manufacturers' deduction & other permanent differences, percentage | 7.50% | 11.00% | 5.80%
Additions for tax positions of prior years | $ 50,000 | $ 215,000 | $ 0
Additions for tax positions of prior years, percentage | 1.30% | 5.10% | 0.00%
Change in tax rates | $ (24,000) | $ (138,000) | $ 0
Change in tax rates, percentage | 0.00% | 3.20% | 0.00%
Change in tax estimate | $ (24,000) | $ 58,000 | $ (89,000)
Change in tax estimate, percentage | (0.60%) | 1.40% | 1.10%
Provision for income taxes | $ 2,020,000 | $ 2,242,000 | $ 2,867,000
Provision for income taxes, percentage | 50.60% | 53.40% | 36.60%

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