Condensed Statement of Comprehensive Income (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income	$ 1,173,000	$ 791,000	$ 2,559,000	$ 2,032,000
Other Comprehensive Income, Net of Tax Unrealized gain (loss) on securities:
Unrealized holding gains (losses) arising during period	43,000	1,247,000	(595,000)	2,585,000
Reclassification adjustment for gains (losses) included in net income	(171,000)	(88,000)	(134,000)	(205,000)
Income tax benefit (expense) related to other comprehensive income	37,000	(485,000)	210,000	(995,000)
Other Comprehensive Income	(91,000)	674,000	(519,000)	1,385,000
Comprehensive Income	$ 1,082,000	$ 1,465,000	$ 2,040,000	$ 3,417,000