Investments - Schedule of Investments (Details) - USD ($)	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Cost Basis	$ 24,254,000	$ 23,935,000
Gross Unrealized Gains	2,545,000	1,324,000
Gross Unrealized Losses	(417,000)	(729,000)
Fair Value	26,382,000	24,530,000
Municipal Bonds [Member]
Cost Basis	6,045,000	6,489,000
Gross Unrealized Gains	90,000	133,000
Gross Unrealized Losses	(97,000)	(239,000)
Fair Value	6,038,000	6,383,000
Corporate Bonds [Member]
Cost Basis	129,000	130,000
Gross Unrealized Gains	1,000
Gross Unrealized Losses		(4,000)
Fair Value	130,000	126,000
REITs [Member]
Cost Basis	64,000	42,000
Gross Unrealized Gains	13,000	4,000
Gross Unrealized Losses	(1,000)	(2,000)
Fair Value	76,000	44,000
Equity Securities [Member]
Cost Basis	15,259,000	14,796,000
Gross Unrealized Gains	2,441,000	1,187,000
Gross Unrealized Losses	(319,000)	(484,000)
Fair Value	17,381,000	15,499,000
Money Markets and CDs [Member]
Cost Basis	2,757,000	2,478,000
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value	$ 2,757,000	$ 2,478,000