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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
OPERATING ACTIVITIES    
Net income $ 3,921 $ 2,929
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 331 174
Gain on sale of equipment and property (48) (12)
Amortization of premium related to marketable securities 274 258
Stock-based compensation expense 1,168 487
Excess tax benefits for share-based payments (151) (185)
Deferred income tax provision 897 586
(Increase) decrease in assets:    
Accounts receivable (4,959) (3,037)
Inventories 981 (1,593)
Prepaid expenses and other current assets 770 522
Income taxes receivable (107) (243)
Other non-current assets (424) (80)
Increase (decrease) in liabilities:    
Accounts payable 6,738 4,926
Income taxes payable 181 222
Accrued expenses and other liabilities 1,283 1,120
Other long-term liabilities (1,395) (348)
Net cash provided by operating activities 9,460 5,726
INVESTING ACTIVITIES    
Capital expenditures (324) (804)
Proceeds from sale of assets 48 7
Purchases of marketable securities (7,106) (2,296)
Sales of marketable securities 501 4,685
Maturities of marketable securities 487  
Net cash (used for) provided by investing activities (6,394) 1,592
FINANCING ACTIVITIES    
Payment of dividends (2,301) (1,532)
Excess tax benefits for share-based payments 151 185
Cash paid for common stock purchased and retired (662) (868)
Net cash used for financing activities (2,812) (2,215)
Net increase in cash and cash equivalents 254 5,103
Cash and cash equivalents at beginning of period 7,986 4,072
Cash and cash equivalents at end of period 8,240 9,175
Supplemental information:    
Income tax payments, net $ 844 $ 875