Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Operating activities:
Net cash provided by operating activities	$ 4,195	$ 6,571
Cash used in operating activities - discontinued operations	0	(313)
Net cash provided by (used in) operating activities	4,195	6,258
Investing activities:
Proceeds from sale of investments	0	103
Proceeds from maturity of investments	0	80
Purchases of property, plant and equipment	(12)	(18)
Net cash provided by (used in) investing activities	(12)	165
Financing activities:
Payment of withholding taxes on exercise of restricted stock units	(5)	0
Purchases of treasury stock	(7,044)	(12,945)
Net cash used in financing activities	(7,049)	(12,945)
Decrease in cash and cash equivalents	(2,866)	(6,522)
Cash and cash equivalents, beginning of the period	12,550	37,128
Cash and cash equivalents, end of the period	$ 9,684	$ 30,606

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