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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income $ 18,541,000 $ 19,611,000 $ 11,357,000
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:      
Depreciation and amortization 8,344,000 5,859,000 5,267,000
Realized loss on investment securities, net 207,000 205,000 81,000
Common stock issued for services   50,000 207,000
Share-based compensation 2,524,000 2,628,000 2,151,000
Deferred income taxes 6,015,000 (70,000) (218,000)
Changes in assets and liabilities which provided (used) cash:      
Accounts receivable (854,000) 53,000 (228,000)
Inventory (435,000) (8,302,000) 2,624,000
Prepaid expenses and other current assets (143,000) 1,639,000 (1,066,000)
Other assets (971,000) 138,000 (162,000)
Accounts payable and accrued expenses 3,810,000 7,302,000 705,000
Income taxes, prepaid (2,168,000) (344,000) (1,563,000)
Net cash provided by operating activities 34,870,000 28,769,000 19,155,000
Cash Flow from Investing Activities:      
Sale of investment securities 8,064,000 5,487,000 1,178,000
Purchase of investment securities (10,278,000) (16,973,000) (4,442,000)
Purchase of property and equipment (14,273,000) (12,055,000) (5,117,000)
Purchase of intangible assets (387,000)   (235,000)
Net cash used in investing activities (16,874,000) (23,541,000) (8,616,000)
Cash Flow from Financing Activities:      
Issuance of common stock, options and warrants   34,000 214,000
Proceeds of long-term debt   393,000 2,600,000
Repayment of long-term debt (1,136,000) (834,000) (930,000)
Net change in line of credit     (3,163,000)
Decrease in note receivable 12,000 5,000 170,000
Excess tax benefits from share-based compensation 614,000 1,770,000 303,000
Purchase of treasury stock (20,389,000) (35,000) (102,000)
Net cash provided by (used in) financing activities (20,899,000) 1,333,000 (908,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS (2,903,000) 6,561,000 9,631,000
Cash and cash equivalents - beginning of the period 17,165,000 10,604,000 973,000
Cash and cash equivalents - end of period 14,262,000 17,165,000 10,604,000
Supplemental disclosure of cash flow information:      
Interest paid 96,000 111,000 145,000
Income taxes 4,125,000 10,677,000 9,167,000
Supplemental disclosure of non cash activity:      
Capitalized lease additions 1,014,000    
Treasury stock received in payment of note receivable     $ 931,500