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Condensed Consolidated Statements of Cash Flows (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net income from consolidated operations $ 7,692,073 $ 7,775,262
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 2,117,538 1,981,775
Gain on sale of fixed assets (12,363) (833,792)
Stock issued in lieu of cash compensation   55,000
Share-based compensation 679,340 860,006
Excess tax benefit on share-based compensation (327,707) (419,452)
Deferred income taxes 337,956 (7,125)
Changes in operating assets and liabilities:    
Receivables, net (1,349,442) (481,672)
Inventories 739,351 (961,921)
Taxes receivable 288,118 559,458
Prepaid expenses (38,204) 262,154
Accounts payable 300,479 849,153
Accrued taxes and other expenses 418,668 (33,567)
Retirement and other liabilities 236,336 (57,917)
Other assets (259,647) 61,396
Net cash provided by operating activities 10,822,496 9,608,758
Cash flows from investing activities:    
Additions to property, plant, and equipment (8,048,911) (2,638,297)
Proceeds from sale of fixed assets 12,363 1,217,694
Redemption of cash value life insurance 131,621  
Net cash used in investing activities (7,904,927) (1,420,603)
Cash flows from financing activities:    
Principal repayments of long-term debt (435,496) (1,136,794)
Proceeds from exercise of stock options, net of attestation 365,237 234,063
Excess tax benefit on share-based compensation 327,707 419,452
Payment of statutory withholdings for stock options exercised and restricted stock units vested (672,284) (829,995)
Distribution to United Development Company Limited (non-controlling interests) (1,196,223) (289,183)
Net cash used in financing activities (1,611,059) (1,602,457)
Net increase in cash and cash equivalents 1,306,510 6,585,698
Cash and cash equivalents at beginning of period 29,848,798 22,102,634
Cash and cash equivalents at end of period $ 31,155,308 $ 28,688,332