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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
OPERATING ACTIVITIES    
Net income $ 7,609 $ 5,261
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 417 359
Gain on sale of equipment and property   (8)
Amortization of premium related to marketable securities 87 64
Stock-based compensation expense 516 508
Deferred income tax provision 129 276
(Increase) decrease in assets:    
Accounts receivable (4,761) (7,429)
Inventories (6,034) 3,920
Prepaid expenses and other current assets 784 689
Income taxes receivable (406) (923)
Other non-current assets (2) (111)
Increase (decrease) in liabilities:    
Accounts payable 7,636 5,145
Accrued expenses and other liabilities 1,562 2,232
Other long-term liabilities (27) 67
Net cash provided by operating activities 7,510 10,050
INVESTING ACTIVITIES    
Capital expenditures (309) (318)
Proceeds from sale of assets   8
Purchases of marketable securities (3,581) (4,262)
Sales of marketable securities 4,675 2,389
Maturities of marketable securities 350  
Net cash provided by (used for) investing activities 1,135 (2,183)
FINANCING ACTIVITIES    
Payment of dividends (3,465) (2,436)
Cash paid for common stock purchased and retired (2,935) (1,223)
Net cash used for financing activities (6,400) (3,659)
Net increase in cash and cash equivalents 2,245 4,208
Cash and cash equivalents at beginning of period 7,684 2,619
Cash and cash equivalents at end of period 9,929 6,827
Supplemental information:    
Income tax payments, net $ 1,556 $ 2,362