Schedule of Investments (Details) - USD ($)	6 Months Ended	12 Months Ended
	Oct. 31, 2022	Apr. 30, 2022
Marketable Securities [Line Items]
Cost Basis	$ 24,707,000	$ 24,706,000
Gross Unrealized Gains	6,213,000	6,978,000
Gross Unrealized Losses	(1,312,000)	(705,000)
Fair Value	29,608,000	30,979,000
Municipal Bonds [Member]
Marketable Securities [Line Items]
Cost Basis	5,515,000	5,625,000
Gross Unrealized Gains	35,000	41,000
Gross Unrealized Losses	(397,000)	(229,000)
Fair Value	5,153,000	5,437,000
Real Estate Investment [Member]
Marketable Securities [Line Items]
Cost Basis	93,000	131,000
Gross Unrealized Gains		16,000
Gross Unrealized Losses	(15,000)	(3,000)
Fair Value	78,000	144,000
Equity Securities [Member]
Marketable Securities [Line Items]
Cost Basis	18,107,000	18,322,000
Gross Unrealized Gains	6,178,000	6,921,000
Gross Unrealized Losses	(900,000)	(473,000)
Fair Value	23,385,000	24,770,000
Money Markets and CDs [Member]
Marketable Securities [Line Items]
Cost Basis	992,000	628,000
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value	$ 992,000	$ 628,000