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Provision For Income Taxes (Details 1) - USD ($)
12 Months Ended
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%