Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities
Net income	$ 26,907	$ 21,220	$ 17,934
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,070	8,395	5,416
Stock-based compensation	3,479	3,022	2,642
Fair value adjustments to contingent consideration obligations	(674)	182	171
Provision for doubtful accounts and allowances	263	293	388
Provision for inventory write-downs	3,779	1,523	747
Provision (benefit) for deferred income taxes	79	(328)	824
Gains on sale of building, acquisitions and divestitures	0	(470)	0
Foreign currency transaction gain	163	100	(57)
Changes in operating assets and liabilities:
Accounts receivable	(818)	(939)	(1,301)
Inventory and other deferred costs	(5,485)	(2,609)	(11,335)
Prepaid expenses and other assets	(1,927)	89	(654)
Accounts payable and other liabilities	(1,734)	4,322	(596)
Net cash provided by operating activities	35,102	34,800	14,179
Investing activities
Purchases of property and equipment	(4,882)	(2,982)	(3,761)
Proceeds from sale of building	0	2,023	0
Payments related to acquisitions	0	(72,627)	(21,240)
Purchases of short-term marketable securities	(59,194)	(2,205)	(22,699)
Proceeds from sales of marketable securities	3,000	22,900	23,600
Net cash used in investing activities	(61,076)	(52,891)	(24,100)
Financing activities
Payment of deferred acquisition consideration	(401)	(2,800)	(2,059)
Proceeds from revolving line of credit	0	25,000	0
Proceeds from issuance of long-term debt	0	40,000	0
Payments of revolving line of credit	0	(25,000)	0
Payments of long-term debt	(39,000)	(1,000)	0
Payment of deferred debt issuance costs	0	(1,751)	0
Proceeds from issuance of common stock	63,241	5,971	4,856
Purchase of treasury stock for net settlement of equity awards	(802)	(570)	(683)
Common stock cash dividend paid	(9,336)	(7,695)	(6,736)
Net cash provided by (used in) financing activities	13,702	32,155	(4,622)
Effect of exchange rate changes on cash and cash equivalents	(637)	914	11
Net increase (decrease) in cash and cash equivalents	(12,909)	14,978	(14,532)
Cash and cash equivalents at beginning of year	26,764	11,786	26,318
Cash and cash equivalents at end of year	$ 13,855	$ 26,764	$ 11,786