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Condensed Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (261)	$ (135)	$ (2,199)	$ 863
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes	(15)	1	(7)	24
Comprehensive income (loss)	$ (276)	$ (134)	$ (2,206)	$ 887

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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