Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Operating activities:
Cash provided by (used in) operating activities	$ 681	$ (352)
Net cash provided by (used in) operating activities	681	(352)
Investing activities:
Purchases of property, plant and equipment	(8)	(66)
Proceeds from sale of property, plant and equipment	23	24
Net cash provided by (used in) investing activities	15	(42)
Financing activities:
Payment of withholding taxes on exercise of restricted stock units	(6)	0
Purchases of treasury stock	(2,163)	(6,491)
Net cash used in financing activities	(2,169)	(6,491)
Decrease in cash and cash equivalents	(1,473)	(6,885)
Cash and cash equivalents, beginning of the period	9,388	18,169
Cash and cash equivalents, end of the period	$ 7,915	$ 11,284

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