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Condensed Consolidated Statements of Cash Flows (USD $)
6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net income $ 5,012,465 $ 5,095,800
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,976,580 1,404,839
(Gain)/loss on sale of fixed assets 11,207 (12,363)
Share-based compensation 507,486 497,054
Excess tax benefit on share-based compensation (7,552) (276,596)
Deferred income taxes (7,112) 184,900
Changes in operating assets and liabilities:    
Receivables, net (826,044) (775,735)
Inventories (1,195,928) (160,827)
Taxes receivable 1,713,687 584,298
Prepaid expenses (540,450) (307,673)
Accounts payable (108,107) 136,420
Accrued taxes and other expenses (1,559,081) (89,938)
Retirement and other liabilities 203,403 173,146
Other assets (105,515) (547,354)
Net cash provided by operating activities 5,075,039 5,905,971
Cash flows from investing activities:    
Additions to property, plant, and equipment (3,544,727) (5,029,274)
Holdback payment related to the acquisition of PAC Foam (200,000)  
Proceeds from sale of fixed assets 5,293 12,363
Redemption of cash value life insurance   131,621
Net cash used in investing activities (3,739,434) (4,885,290)
Cash flows from financing activities:    
Proceeds from the issuance of long-term debt 579,650  
Principal repayments of long-term debt (769,876) (290,331)
Proceeds from exercise of stock options, net of attestation 65,063 262,966
Excess tax benefit on share-based compensation 7,552 276,596
Payment of statutory withholdings for stock options exercised and restricted stock units vested (426,164) (672,284)
Distribution to United Development Company Limited (non-controlling interests)   (1,209,732)
Net cash used in financing activities (543,775) (1,632,785)
Net increase (decrease) in cash and cash equivalents 791,830 (612,104)
Cash and cash equivalents at beginning of period 33,479,519 29,848,798
Cash and cash equivalents at end of period $ 34,271,349 $ 29,236,694