Investments - Schedule of Unrealized Loss Breakdown by Investment (Details) - USD ($)	Jan. 31, 2019	Apr. 30, 2018
Less than 12 months Fair Value	$ 7,484,000	$ 3,560,000
Less than 12 months Unrealized Loss	(384,000)	(333,000)
12 months or greater Fair Value	1,224,000	3,235,000
12 months or greater Unrealized Loss	(185,000)	(294,000)
Total Fair Value	8,708,000	6,795,000
Total Unrealized Loss	(569,000)	(627,000)
Municipal Bonds [Member]
Less than 12 months Fair Value	2,678,000	960,000
Less than 12 months Unrealized Loss	(33,000)	(200,000)
12 months or greater Fair Value	618,000	2,385,000
12 months or greater Unrealized Loss	(55,000)	(109,000)
Total Fair Value	3,296,000	3,345,000
Total Unrealized Loss	(88,000)	(309,000)
REITs [Member]
Less than 12 months Fair Value		55,000
Less than 12 months Unrealized Loss		(6,000)
12 months or greater Fair Value	87,000	27,000
12 months or greater Unrealized Loss	(2,000)	(1,000)
Total Fair Value	87,000	82,000
Total Unrealized Loss	(2,000)	(7,000)
Equity Securities [Member]
Less than 12 months Fair Value	4,806,000	2,545,000
Less than 12 months Unrealized Loss	(351,000)	(127,000)
12 months or greater Fair Value	519,000	823,000
12 months or greater Unrealized Loss	(128,000)	(184,000)
Total Fair Value	5,325,000	3,368,000
Total Unrealized Loss	$ (479,000)	$ (311,000)