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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 $ 13,006,000 $ 6,804,000
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:    
Depreciation and amortization 5,221,000 5,190,000
Realized gain on investment securities, net (198,000) (48,000)
Share-based compensation 1,151,000 1,455,000
Deferred income taxes (552,000) (616,000)
Loss on disposal of fixed assets 61,000 44,000
Changes in assets and liabilities which provided (used) cash:    
Accounts receivable 183,000 (918,000)
Inventory 4,823,000 3,704,000
Prepaid expenses and other current assets 314,000 (843,000)
Other assets 708,000 429,000
Accounts payable and accrued expenses 2,461,000 11,256,000
Income taxes 539,000 4,992,000
Net cash provided by operating activities 27,717,000 31,449,000
Cash Flow from Investing Activities:    
Sale of investment securities 5,909,000 5,411,000
Purchase of investment securities (20,187,000) (5,200,000)
Purchase of property and equipment (5,577,000) (5,347,000)
Net cash used in investing activities (19,855,000) (5,136,000)
Cash Flow from Financing Activities:    
Repayment of long-term debt and capital leases (3,504,000) (1,163,000)
Decrease in note receivable 12,000 8,000
Excess tax benefits from share-based compensation 98,000 464,000
Purchase of treasury stock 0 (2,764,000)
Net cash used in financing activities (3,394,000) (3,455,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS 4,468,000 22,858,000
Cash and cash equivalents - beginning of the period 39,937,000 14,262,000
Cash and cash equivalents - end of period 44,405,000 37,120,000
Supplemental disclosure of cash flow information:    
Interest paid 38,000 56,000
Income taxes paid 6,418,000 105,000
Supplemental disclosure of non cash activity:    
Capitalized lease additions $ 0 $ 104,000