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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
OPERATING ACTIVITIES      
Net income $ 7,528 $ 6,979 $ 6,731
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation expense 726 768 889
Gain on sale of equipment and property (15)    
Gain on benefit plan financing arrangement     (2,025)
Stock-based compensation expense 1,702 1,495 1,296
Excess tax benefits for share-based payments (136) (379) (77)
Deferred income tax provision (benefit) 78 (498) (76)
(Increase) decrease in assets:      
Accounts receivable (227) 415 (1,031)
Inventories (700) (3,252) (3,025)
Prepaid expenses and other current assets (232) (147) (10)
Income taxes receivable (298) (394) 558
Other non-current assets (184) 456 (67)
Increase (decrease) in liabilities:      
Accounts payable 1,323 1,254 1,108
Income taxes payable 134 (14) 327
Other accrued expenses (5) 1,731 (1,281)
Other long-term liabilities 186 (232) (21)
Net cash provided by operating activities 9,880 8,182 3,296
INVESTING ACTIVITIES      
Capital expenditures (521) (354) (357)
Proceeds from sale of assets 15    
Proceeds from benefit plan financing arrangement     3,671
Re-investment in benefit plan financing arrangement     (3,671)
Sales and maturities of marketable securities 14,576 51,247 24,904
Purchases of marketable securities (14,339) (34,082) (36,106)
Net cash (used for) provided by investing activities (269) 16,811 (11,559)
FINANCING ACTIVITIES      
Payment of dividends (5,705) (23,812)  
Cash paid for common stock purchased and retired (576) (960) (447)
Repayment of capital lease obligation   (375)  
Excess tax benefits for share-based payments 136 379 77
Proceeds received upon exercise of stock options   467 54
Net cash used for financing activities (6,145) (24,301) (316)
Net increase (decrease) in cash and cash equivalents 3,466 692 (8,579)
Cash and cash equivalents at beginning of year 1,648 956 9,535
Cash and cash equivalents at end of year $ 5,114 $ 1,648 $ 956