Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities
Net income	$ 5,929	$ 3,174
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,624	1,538
Stock-based compensation	927	779
Fair value adjustment to contingent consideration obligations	47	64
Provision for doubtful accounts	59	71
Provision for inventory write-downs	1,005	196
Foreign currency transaction loss	33	208
Changes in operating assets and liabilities:
Accounts receivable	(857)	(368)
Inventory and other deferred costs	(1,346)	(1,861)
Prepaid expenses and other assets	638	659
Accounts payable and other liabilities	(2,985)	(3,271)
Net cash provided by operating activities	6,074	1,189
Investing activities
Purchases of property and equipment and other assets	(1,059)	(863)
Purchases of short-term marketable securities	(1)	(2,103)
Sales of short-term marketable securities	0	3,000
Payments related to acquisitions	0	(59)
Net cash used in investing activities	(1,060)	(25)
Financing activities
Payments of long-term debt	(7,000)	0
Proceeds from stock option exercises	1,385	233
Purchase of treasury stock for net settlement of equity awards	(88)	(57)
Common stock cash dividend paid	(2,262)	(1,917)
Net cash used in financing activities	(7,965)	(1,741)
Effect of exchange rate changes on cash and cash equivalents	(288)	(265)
Net decrease in cash and cash equivalents	(3,239)	(842)
Cash and cash equivalents at beginning of period	26,764	11,786
Cash and cash equivalents at end of period	$ 23,525	$ 10,944