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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income $ 23,969,000 $ 15,876,000 $ 18,541,000
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:      
Depreciation and amortization 11,382,000 11,205,000 8,344,000
Realized gain on investment securities, net (74,000) 2,000 207,000
Share-based compensation 3,209,000 2,850,000 2,524,000
Deferred income taxes (888,000) (1,337,000) 6,015,000
Loss on disposal of fixed assets 425,000 117,000 0
Changes in assets and liabilities which provided (used) cash:      
Accounts receivable 902,000 (671,000) (854,000)
Inventory 2,745,000 (835,000) (435,000)
Prepaid expenses and other current assets 406,000 (1,045,000) (143,000)
Other assets 753,000 150,000 (971,000)
Accounts payable and accrued expenses (1,441,000) 9,391,000 3,810,000
Income taxes 972,000 4,561,000 (2,168,000)
Net cash provided by operating activities 42,360,000 40,264,000 34,870,000
Cash Flow from Investing Activities:      
Sale of investment securities 14,359,000 8,109,000 8,064,000
Purchase of investment securities (25,355,000) (8,390,000) (10,278,000)
Purchase of property and equipment (11,606,000) (11,383,000) (14,273,000)
Purchase of intangible assets 0 0 (387,000)
Net cash used in investing activities (22,602,000) (11,664,000) (16,874,000)
Cash Flow from Financing Activities:      
Repayment of long-term debt and capital leases (3,641,000) (1,444,000) (1,136,000)
Decrease in note receivable 26,000 18,000 12,000
Excess tax benefits from share-based compensation 383,000 1,265,000 614,000
Purchase of treasury stock (20,081,000) (2,764,000) (20,389,000)
Net cash used in financing activities (23,313,000) (2,925,000) (20,899,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS (3,555,000) 25,675,000 (2,903,000)
Cash and cash equivalents - beginning of the period 39,937,000 14,262,000 17,165,000
Cash and cash equivalents - end of period 36,382,000 39,937,000 14,262,000
Supplemental disclosure of cash flow information:      
Interest paid 57,000 123,000 96,000
Income taxes paid 9,983,000 4,093,000 4,125,000
Supplemental disclosure of non cash activity:      
Capitalized lease additions $ 0 $ 104,000 $ 1,014,000