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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
OPERATING ACTIVITIES:    
Net income $ 2,300 $ 1,207
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 936 898
Gain on disposal of equipment   4
Loss on deconsolidation of subsidiary 83  
Provision for doubtful accounts 45 47
Excess tax benefit from stock-based compensation (22) (127)
Issuance of non-employee director shares 96 75
Deferred income tax provision (181) 3
Changes in operating assets and liabilities:    
Accounts receivable (1,259) (4,889)
Inventories (3,629) (5,099)
Prepaid expenses (1,774) (1,407)
Accounts payable 2,754 9,098
Accrued liabilities (95) 862
Net cash flows from operating activities (746) 672
INVESTING ACTIVITIES:    
Purchases of property, plant and equipment (202) (815)
Payments received on notes receivable 9 10
Net cash flows from investing activities (193) (805)
FINANCING ACTIVITIES:    
Payments of cash dividends (1,692) (1,569)
Proceeds from stock option exercises 172 405
Excess tax benefit from stock-based compensation 22 127
Net cash flows from financing activities (1,498) (1,037)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND TEMPORARY INVESTMENTS 117 6
NET CHANGE IN CASH AND TEMPORARY INVESTMENTS (2,320) (1,164)
CASH AND TEMPORARY INVESTMENTS, beginning of period 42,864 48,591
CASH AND TEMPORARY INVESTMENTS, end of period 40,544 47,427
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash payments for interest 223 207
Cash payments for income taxes, net of refunds $ 1,701 $ (411)