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Statutory Tax Rate and Effective Tax Rate (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statutory Tax Rate And Effective Tax Rate [Line Items]      
Statutory federal tax $ 10,381,000 $ 11,093,000 $ 13,665,000
State income taxes, net of federal benefit 414,000 314,000 393,000
Foreign Taxes 15,000 73,000 0
Domestic manufacturer deduction (824,000) (811,000) (979,000)
Other permanent differences 4,000 200,000 173,000
Research and development and jobs credits (247,000) (203,000) (459,000)
Other state income tax benefits 114,000 (113,000) (707,000)
Other 247,000 111,000 (178,000)
Income Tax Expense, Total $ 10,104,000 $ 10,664,000 $ 11,908,000
Effective tax rate, Statutory federal tax 35.00% 35.00% 35.00%
Effective tax rate, State income taxes, net of federal benefit 1.40% 1.00% 1.00%
Effective Income Tax Rate Reconciliation, Foreign Taxes 0.10% 0.20% 0.00%
Effective tax rate, Domestic manufacturer deduction (2.80%) (2.60%) (2.50%)
Effective tax rate, Other permanent differences 0.00% 0.60% 0.40%
Effective tax rate, Research and development and jobs credits (0.80%) (0.60%) (1.20%)
Effective tax rate, Other state income tax benefits 0.40% (0.40%) (1.80%)
Effective tax rate, Other 0.80% 0.40% (0.40%)
Effective tax rate, Total 34.10% 33.60% 30.50%