Investments - Schedule of Unrealized Loss Breakdown by Investment (Details) - USD ($)	Jul. 31, 2018	Apr. 30, 2018
Less than 12 months Fair Value	$ 3,161,000	$ 1,292,000
Less than 12 months Unrealized Loss	(112,000)	(192,000)
12 months or greater Fair Value	2,357,000	2,291,000
12 months or greater Unrealized Loss	(260,000)	(225,000)
Total Fair Value	5,518,000	3,583,000
Total Unrealized Loss	(372,000)	(447,000)
Municipal Bonds [Member]
Less than 12 months Fair Value	1,857,000	702,000
Less than 12 months Unrealized Loss	(9,000)	(152,000)
12 months or greater Fair Value	1,211,000	1,674,000
12 months or greater Unrealized Loss	(90,000)	(86,000)
Total Fair Value	3,068,000	2,376,000
Total Unrealized Loss	(99,000)	(238,000)
REITs [Member]
Less than 12 months Fair Value	35,000	56,000
Less than 12 months Unrealized Loss	(3,000)	(5,000)
12 months or greater Fair Value		27,000
12 months or greater Unrealized Loss		(1,000)
Total Fair Value	35,000	83,000
Total Unrealized Loss	(3,000)	(6,000)
Equity Securities [Member]
Less than 12 months Fair Value	1,269,000	534,000
Less than 12 months Unrealized Loss	(100,000)	(35,000)
12 months or greater Fair Value	1,146,000	590,000
12 months or greater Unrealized Loss	(170,000)	(168,000)
Total Fair Value	2,415,000	1,124,000
Total Unrealized Loss	$ (270,000)	$ (203,000)