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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income $ 10,895,297 $ 10,783,616 $ 9,407,517
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 2,928,185 2,781,002 3,152,193
Gain on sales of property, plant, and equipment (12,046) (838,592) (12,000)
Share-based compensation 860,405 1,088,672 963,710
Stock issued in lieu of compensation   55,000 79,248
Deferred income taxes 610,066 451,702 305,830
Excess tax benefits on share-based compensation (831,584) (699,659) (854,015)
Changes in operating assets and liabilities, net of effects from acquisition:      
Receivables, net (842,332) (985,342) (415,370)
Inventories 800,977 (1,714,287) (396,819)
Prepaid expenses (64,798) 476,426 (558,920)
Refundable income taxes (695,055) 327,394 (1,414,026)
Accounts payable 383,440 507,018 160,922
Accrued expenses 2,143,005 (439,559) 1,380,570
Retirement and other liabilities 190,107 (12,398) 234,332
Other assets (203,482) (65,492) (205,445)
Net cash provided by operating activities 16,162,185 11,715,501 11,827,727
Cash flows from investing activities:      
Additions to property, plant, and equipment (11,993,750) (3,740,891) (3,285,530)
Acquisition of PAC Foam net of cash acquired (3,596,575)    
Proceeds from sale of property, plant, and equipment 85,963 1,222,494 12,000
Net cash used in investing activities (15,504,362) (2,518,397) (3,273,530)
Cash flows from financing activities:      
Distribution to United Development Company Partners (non-controlling interest) (1,196,223) (289,183) (105,000)
Excess tax benefits on share-based compensation 831,584 699,659 854,015
Proceeds from the exercise of stock options net of attestations 365,241 250,538 507,056
Principal repayment of long-term debt (739,903) (1,281,959) (623,552)
Payment of statutory withholding for stock options exercised and restricted stock units vested (672,284) (829,995) (485,511)
Proceeds from long-term borrowings 4,384,483    
Net cash provided by (used in) financing activities 2,972,898 (1,450,940) 147,008
Net change in cash and cash equivalents 3,630,721 7,746,164 8,701,205
Cash and cash equivalents at beginning of year 29,848,798 22,102,634 13,401,429
Cash and cash equivalents at end of year $ 33,479,519 $ 29,848,798 $ 22,102,634