Schedule of Investments (Details) - USD ($)	9 Months Ended	12 Months Ended
	Jan. 31, 2022	Apr. 30, 2021
Net Investment Income [Line Items]
Cost Basis	$ 24,604,000	$ 23,956,000
Gross Unrealized Gains	8,830,000	9,503,000
Gross Unrealized Losses	(280,000)	(122,000)
Fair Value	33,154,000	33,337,000
Municipal Bonds [Member]
Net Investment Income [Line Items]
Cost Basis	5,678,000	5,854,000
Gross Unrealized Gains	92,000	198,000
Gross Unrealized Losses	(79,000)	(43,000)
Fair Value	5,691,000	6,009,000
Real Estate Investment [Member]
Net Investment Income [Line Items]
Cost Basis	131,000	131,000
Gross Unrealized Gains	15,000	11,000
Gross Unrealized Losses	(5,000)	(5,000)
Fair Value	141,000	137,000
Equity Securities [Member]
Net Investment Income [Line Items]
Cost Basis	18,360,000	17,199,000
Gross Unrealized Gains	8,723,000	9,294,000
Gross Unrealized Losses	(196,000)	(74,000)
Fair Value	26,887,000	26,419,000
Money Markets and CDs [Member]
Net Investment Income [Line Items]
Cost Basis	435,000	772,000
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value	$ 435,000	$ 772,000