Condensed Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from (used in) operating activities
Net loss	$ (2)	$ (91)
Adjustments to reconcile net loss to net cash from (used in) operating activities:
Depreciation and amortization	90	90
Deferred income taxes	(7)	(4)
Stock-based compensation expense	1	3
Interest accrued on treasury bills	(2)	0
Other Noncash Expense	0	3
Change in:
Trade receivables	(252)	102
Inventories	4	(26)
Other current assets	(36)	(45)
Accounts payable	(7)	69
Accrued expenses	159	(20)
Income tax receivable/payable	7	(15)
Net cash from (used in) operating activities	(45)	66
Cash flows from (used in) investing activities
Purchases of treasury bills	(4,999)	(999)
Proceeds from the maturity of treasury bills	5,000	0
Net cash from (used in) investing activities	1	(999)
Cash flows used in financing activities
Payments on financing lease	(1)	(2)
Net cash used in financing activities	(1)	(2)
Net decrease in cash and cash equivalents	(45)	(935)
Cash and cash equivalents, beginning	1,090	8,785
Cash and cash equivalents, ending	1,045	7,850
Supplemental cash flow information
Cash paid for income taxes	$ 0	$ 0