Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating activities:
Net cash provided by operating activities	$ 7,092	$ 3,805
Cash used in operating activities - discontinued operations	0	(313)
Net cash provided by operating activities	7,092	3,492
Investing activities:
Proceeds from sale of investments	0	0
Proceeds from maturity of investments	0	80
Purchases of property, plant and equipment	(12)	(18)
Net cash provided by (used in) investing activities	(12)	62
Financing activities:
Payment of withholding taxes on exercise of restricted stock units	(5)	0
Purchases of treasury stock	(8,078)	(19,853)
Net cash used in financing activities	(8,083)	(19,853)
Decrease in cash and cash equivalents	(1,003)	(16,299)
Cash and cash equivalents, beginning of the period	12,550	37,128
Cash and cash equivalents, end of the period	$ 11,547	$ 20,829