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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net income $ 5,933,000 $ 3,990,000
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:    
Depreciation and amortization 2,630,000 2,381,000
Realized gain on investment securities, net (23,000) (13,000)
Share-based compensation 546,000 573,000
Deferred income taxes (557,000) 111,000
Loss on disposal of fixed assets 15,000 40,000
Changes in assets and liabilities which provided (used) cash:    
Accounts receivable (304,000) (700,000)
Inventory 2,385,000 4,622,000
Prepaid expenses and other current assets (107,000) (585,000)
Other assets 647,000 251,000
Accounts payable and accrued expenses 2,561,000 7,333,000
Income taxes 1,054,000 2,705,000
Net cash provided by operating activities 14,780,000 20,708,000
Cash Flow from Investing Activities:    
Sale of investment securities 2,578,000 2,582,000
Purchase of investment securities (2,115,000) (2,859,000)
Purchase of property and equipment (2,535,000) (2,492,000)
Net cash used in investing activities (2,072,000) (2,769,000)
Cash Flow from Financing Activities:    
Repayment of long-term debt and capital leases (3,421,000) (270,000)
Decrease in note receivable 6,000 4,000
Net cash used in financing activities (3,415,000) (266,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS 9,293,000 17,673,000
Cash and cash equivalents - beginning of the period 39,937,000 14,262,000
Cash and cash equivalents - end of period 49,230,000 31,935,000
Supplemental disclosure of cash flow information:    
Interest paid 30,000 29,000
Income taxes paid $ 2,183,000 $ 515,000