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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income $ 2,444 $ 6,776 $ 5,596
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization expense 1,873 2,058 1,972
Amortization of deferred rent (73) (95) (79)
Stock-based compensation expense 667 848 401
Provision for (recoveries of) doubtful accounts, net 132 (4) (71)
Write-down of inventory to net realizable value 653 496 946
Loss on disposal of assets 54 7
Tax benefit from exercise of stock options (690) (41) (211)
Deferred income taxes 439 (4) (495)
Changes in operating assets and liabilities:      
Receivables 1,085 1,201 (251)
Inventories 1,869 (2,249) (2,614)
Prepaid expenses and other assets (209) 824 844
Accounts payable 733 (242) (84)
Accrued liabilities (319) (1,219) 1,451
Income taxes payable (207) 323 (947)
Deferred product revenue (665) (447) 858
Other long-term liabilities 48 (638) (606)
Net cash provided by operating activities 7,834 7,594 6,710
Cash flows from investing activities:      
Payment towards business acquisitions (13,068)
Purchase of property and equipment (730) (359) (642)
Purchase of intangibles (161) (90)
Proceeds from maturities and sales of marketable securities 9,795 7,341 4,650
Purchase of marketable securities (9,826) (7,630) (5,266)
Net cash used in investing activities (922) (648) (14,416)
Cash flows from financing activities:      
Net proceeds from equity-based compensation programs 773 463 1,337
Repurchase and cancellation of stock options (1,752)
Tax benefits from equity-based compensation programs 690 41 211
Stock registration costs (55)
Dividend payments (1,817) (1,417) (914)
Payments for stock repurchases (6,086) (2,598)
Net cash used in financing activities (8,192) (913) (2,019)
Effect of exchange rate changes on cash and cash equivalents (32) (61) (27)
Net increase (decrease) in cash and cash equivalents (1,312) 5,972 (9,752)
Cash and cash equivalents at the beginning of the year 13,412 7,440 17,192
Cash and cash equivalents at the end of the year 12,100 13,412 7,440
Supplemental disclosure of cash flow information:      
Cash paid for interest 3
Cash paid for income taxes 1,154 3,730 3,017
Supplemental disclosure of non-cash investing and financing activities:      
Issuance of common stock in connection with acquisition of Sabine $ 1,679