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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net income $ 6,804,000 $ 12,302,000
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:    
Depreciation and Amortization 5,190,000 3,662,000
Realized (gain) on investment securities, net (48,000) (12,000)
Share-based compensation 1,455,000 1,299,000
Deferred income taxes (616,000) 209,000
Loss on disposal of fixed assets 44,000  
Changes in assets and liabilities which provided (used) cash:    
Accounts receivable (918,000) (524,000)
Inventory 3,704,000 3,823,000
Prepaid expenses and other current assets (843,000) 325,000
Other assets 429,000 (1,000)
Accounts payable and accrued expenses 11,256,000 5,915,000
Income taxes 4,992,000 3,508,000
Net cash provided by operating activities 31,449,000 30,506,000
Cash Flow from Investing Activities:    
Sale of investment securities 5,411,000 4,927,000
Purchase of investment securities (5,200,000) (6,277,000)
Purchase of property and equipment (5,347,000) (5,549,000)
Purchase of intangible assets   (131,000)
Net cash used in investing activities (5,136,000) (7,030,000)
Cash Flow from Financing Activities:    
Repayment of long-term debt and capital leases (1,163,000) (730,000)
Decrease in note receivable 8,000 5,000
Excess tax benefits from share-based compensation 464,000 709,000
Purchase of treasury stock (2,764,000) (12,333,000)
Net cash used in financing activities (3,455,000) (12,349,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS 22,858,000 11,127,000
Cash and cash equivalents - beginning of the period 14,262,000 17,165,000
Cash and cash equivalents - end of period 37,120,000 28,292,000
Supplemental disclosure of cash flow information:    
Interest paid 56,000 50,000
Income taxes paid 105,000 2,639,000
Supplemental disclosure of non cash activity:    
Capitalized lease additions $ 104,000