Condensed Statements of Comprehensive Income (Unaudited) - USD ($)	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 617,000	$ 518,000
Other Comprehensive Income, Net of Tax Unrealized gain (loss) on securities:
Unrealized holding gains (losses) arising during period	607,000	629,000
Reclassification adjustment for gains (losses) included in net income	44,000	(84,000)
Income tax expense related to other comprehensive income	(188,000)	(228,000)
Other Comprehensive Income (Loss)	463,000	317,000
Comprehensive Income	$ 1,080,000	$ 835,000