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Note 11 - Comprehensive Income - Components of Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2021	Dec. 31, 2020	Apr. 30, 2020	Dec. 31, 2019	Apr. 30, 2019
Change in unrealized gains on available-for-sale fixed income securities, amount before tax	$ (173)		$ 134		$ 46
Change in unrealized gains on available-for-sale fixed income securities, tax (expense)/benefit	45		(37)		(10)
Change in unrealized gains on available-for-sale fixed income securities, amount net of tax	(128)		97		36
Other comprehensive income (loss), available-for-sale securities adjustment, amount before tax	(173)		134		46
Other comprehensive income (loss), available-for-sale securities, tax expense	45		(37)		(10)
Other comprehensive income (loss), available-for-sale securities adjustment, amount net of tax	$ (128)	$ 97	$ 97	$ 36	$ 36

X

- Definition

Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.

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