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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
OPERATING ACTIVITIES    
Net income $ 5,261 $ 3,921
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 359 331
Gain on sale of equipment and property (8) (48)
Amortization of premium related to marketable securities 64 274
Stock-based compensation expense 508 1,168
Excess tax benefits for share-based payments   (151)
Deferred income tax provision 276 897
(Increase) decrease in assets:    
Accounts receivable (7,429) (4,959)
Inventories 3,920 981
Prepaid expenses and other current assets 689 770
Income taxes receivable (923) (107)
Other non-current assets (111) (424)
Increase (decrease) in liabilities:    
Accounts payable 5,145 6,738
Accrued expenses and other liabilities 2,232 1,464
Other long-term liabilities 67 (1,395)
Net cash provided by operating activities 10,050 9,460
INVESTING ACTIVITIES    
Capital expenditures (318) (324)
Proceeds from sale of assets 8 48
Purchases of marketable securities (4,262) (7,106)
Sales of marketable securities 2,389 501
Maturities of marketable securities   487
Net cash used for investing activities (2,183) (6,394)
FINANCING ACTIVITIES    
Payment of dividends (2,436) (2,301)
Excess tax benefits for share-based payments   151
Cash paid for common stock purchased and retired (1,223) (662)
Net cash used for financing activities (3,659) (2,812)
Net increase in cash and cash equivalents 4,208 254
Cash and cash equivalents at beginning of period 2,619 7,986
Cash and cash equivalents at end of period 6,827 8,240
Supplemental information:    
Income tax payments, net $ 2,362 $ 844