Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating activities:
Net income	$ 13,152	$ 5,453
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	3,020	2,933
Stock-based compensation	(7,513)	5,247
Deferred income taxes	2,514	1,591
Changes in operating assets and liabilities:
Accounts receivable	3,887	(7,974)
Inventories	311	(1,882)
Prepaid expenses and other assets	(499)	(1,629)
Accounts payable and other liabilities	(7,527)	(6,406)
Other	492	434
Net cash provided by (used in) operating activities	7,837	(2,233)
Investing activities:
Purchases of property, plant and equipment	(720)	(944)
Net cash used in investing activities	(720)	(944)
Financing activities:
Net payments on revolving lines of credit	(559)	(2,000)
Repurchase treasury shares	(1,756)	0
Payment of financing lease principal	(135)	(123)
Proceeds from stock option exercises	15	16
Net cash used in financing activities	(2,435)	(2,107)
Effect of exchange rate changes on cash and cash equivalents	(165)	316
Increase (decrease) in cash, cash equivalents and restricted cash	4,517	(4,968)
Cash, cash equivalents and restricted cash at beginning of period	6,297	12,683
Cash, cash equivalents and restricted cash at end of period	10,814	7,715
Cash, cash equivalents and restricted cash	10,814	7,715
Supplemental disclosure of cash flow information
Net cash paid for income taxes	207	259
Net cash paid for interest	$ 247	$ 358