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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net income $ 5,967,000 $ 5,933,000
Adjustments to reconcile net income to net cash provided by operating activities from continuing operations:    
Depreciation and amortization 2,535,000 2,630,000
Realized gain on investment securities, net (188,000) (23,000)
Share-based compensation 774,000 546,000
Deferred income taxes (268,000) (557,000)
(Gain)/loss on disposal of fixed assets (32,000) 15,000
Changes in assets and liabilities which provided (used) cash:    
Accounts receivable (278,000) (304,000)
Inventory 2,163,000 2,385,000
Prepaid expenses and other current assets (53,000) (107,000)
Other assets 12,000 647,000
Accounts payable and accrued expenses (621,000) 2,561,000
Income taxes 610,000 1,054,000
Net cash provided by operating activities 10,621,000 14,780,000
Cash Flow from Investing Activities:    
Sale of investment securities 3,572,000 2,578,000
Purchase of investment securities (7,943,000) (2,115,000)
Purchase of property and equipment (1,224,000) (2,535,000)
Net cash used in investing activities (5,595,000) (2,072,000)
Cash Flow from Financing Activities:    
Repayment of long-term debt and capital leases (55,000) (3,421,000)
Decrease in note receivable 7,000 6,000
Net cash used in financing activities (48,000) (3,415,000)
NET CHANGE IN CASH AND CASH EQUIVALENTS 4,978,000 9,293,000
Cash and cash equivalents - beginning of the period 36,382,000 39,937,000
Cash and cash equivalents - end of period 41,360,000 49,230,000
Supplemental disclosure of cash flow information:    
Interest paid 53,000 30,000
Income taxes paid $ 2,687,000 $ 2,183,000