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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
OPERATING ACTIVITIES      
Net income $ 6,979 $ 6,731 $ 3,853
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation expense 768 889 1,081
Gain on sale of equipment and property     (37)
Gain on benefit plan financing arrangement   (2,025)  
Stock-based compensation expense 1,495 1,296 1,542
Excess tax benefits for share-based payments (379) (77)  
Deferred income tax benefit (498) (76) (132)
(Increase) decrease in assets:      
Accounts receivable 415 (1,031) 87
Inventories (3,252) (3,025) (2,395)
Prepaid expenses and other current assets (147) (10) 1,332
Income taxes receivable (394) 558 5,823
Other non-current assets 456 (67) (20)
Increase (decrease) in liabilities:      
Accounts payable 1,254 1,108 (88)
Income taxes payable (14) 327 68
Other accrued expenses 1,731 (1,281) (163)
Other long-term liabilities (232) (21) (72)
Net cash provided by operating activities 8,182 3,296 10,879
INVESTING ACTIVITIES      
Capital expenditures (354) (357) (191)
Proceeds from sale of assets     41
Proceeds from benefit plan financing arrangement   3,671  
Re-investment in benefit plan financing arrangement   (3,671)  
Sales and maturities of marketable securities 51,247 24,904 25,579
Purchases of marketable securities (34,082) (36,106) (29,147)
Net cash provided by (used for) investing activities 16,811 (11,559) (3,718)
FINANCING ACTIVITIES      
Payment of dividends (23,812)    
Cash paid for common stock purchased and retired (960) (447) (244)
Repayment of capital lease obligation (375)    
Excess tax benefits for share-based payments 379 77  
Proceeds received upon exercise of stock options 467 54 45
Net cash used for financing activities (24,301) (316) (199)
Net increase (decrease) in cash and cash equivalents 692 (8,579) 6,962
Cash and cash equivalents at beginning of year 956 9,535 2,573
Cash and cash equivalents at end of year $ 1,648 $ 956 $ 9,535