Condensed Consolidated Statements of Cash Flows $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)
Operating activities:
Net income	$ 2,935	$ 6,531	$ 13,152
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization		3,939	3,020
Stock-based compensation		2,574	(7,513)
Deferred income taxes		(308)	2,514
Changes in operating assets and liabilities, net of acquisition
Accounts receivable		(1,664)	3,887
Inventories		(752)	311
Miscellaneous receivables, prepaid expenses and other assets		(975)	(499)
Accounts payable and other liabilities		(561)	(7,527)
Other		508	492
Net cash provided by operating activities		9,292	7,837
Investing activities:
Purchases of property, plant and equipment		(3,874)	(720)
Business acquisition		(33,000)	0
Net cash used in investing activities		(36,874)	(720)
Financing activities:
Net proceeds from revolving line of credit		5,000	(559)
Repurchase treasury shares		(13)	(1,756)
Payment of financing lease principal	(135)	(135)	(135)
Proceeds from stock option exercise		0	15
Net cash provided by (used in) financing activities		4,852	(2,435)
Effect of exchange rate changes on cash and cash equivalents		197	(165)
Increase (decrease) in cash, cash equivalents and restricted cash		(22,533)	4,517
Cash, cash equivalents and restricted cash at beginning of period		29,391	6,297
Cash, cash equivalents and restricted cash at end of period	6,858	6,858	10,814
Cash and cash equivalents	5,855	5,855	10,012
Restricted cash	1,003	1,003	802
Cash, cash equivalents and restricted cash	$ 6,858	6,858	10,814
Supplemental disclosure of cash flow information
Net cash paid for income taxes		3,671	207
Net cash paid for interest		$ 317	$ 247