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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
OPERATING ACTIVITIES    
Net income $ 8,739 $ 7,358
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 671 375
Gain on sale of equipment and property (79) (12)
Amortization of premium related to marketable securities 609 521
Stock-based compensation expense 1,655 984
Excess tax benefits for share-based payments (109) (203)
Deferred income tax provision 608 420
(Increase) decrease in assets:    
Accounts receivable (3,561) (2,213)
Inventories (1,954) (1,317)
Prepaid expenses and other current assets 328 (158)
Income taxes receivable 820 123
Other non-current assets (514) (116)
Increase (decrease) in liabilities:    
Accounts payable 2,375 5,632
Accrued expenses and other liabilities 2,438 1,455
Other long-term liabilities (1,248) (281)
Net cash provided by operating activities 10,778 12,568
INVESTING ACTIVITIES    
Capital expenditures (663) (2,956)
Proceeds from sale of assets 79 7
Purchases of marketable securities (17,997) (7,948)
Sales of marketable securities 2,464 8,174
Maturities of marketable securities 2,901 250
Net cash used for investing activities (13,216) (2,473)
FINANCING ACTIVITIES    
Payment of dividends (4,593) (3,063)
Excess tax benefits for share-based payments 109 203
Cash paid for common stock purchased and retired (768) (1,995)
Net cash used for financing activities (5,252) (4,855)
Net (decrease) increase in cash and cash equivalents (7,690) 5,240
Cash and cash equivalents at beginning of period 7,986 4,072
Cash and cash equivalents at end of period 296 9,312
Supplemental information:    
Income tax payments, net $ 1,772 $ 2,372