Investments - Schedule of Unrealized Loss Breakdown by Investment (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jul. 31, 2017	Apr. 30, 2017
Less than 12 months Fair Value	$ 1,858,000	$ 2,403,000
Less than 12 months Unrealized Loss	(207,000)	(111,000)
12 months or greater Fair Value	2,356,000	3,008,000
12 months or greater Unrealized Loss	(212,000)	(306,000)
Total Fair Value	4,214,000	5,411,000
Total Unrealized Loss	(419,000)	(417,000)
Municipal Bonds [Member]
Less than 12 months Fair Value	968,000	1,420,000
Less than 12 months Unrealized Loss	(115,000)	(19,000)
12 months or greater Fair Value	1,192,000	1,292,000
12 months or greater Unrealized Loss	(71,000)	(78,000)
Total Fair Value	2,160,000	2,712,000
Total Unrealized Loss	(186,000)	(97,000)
REITs [Member]
Less than 12 months Fair Value	57,000
Less than 12 months Unrealized Loss	(6,000)
12 months or greater Fair Value		27,000
12 months or greater Unrealized Loss		(1,000)
Total Fair Value	57,000	27,000
Total Unrealized Loss	(6,000)	(1,000)
Equity Securities [Member]
Less than 12 months Fair Value	833,000	983,000
Less than 12 months Unrealized Loss	(86,000)	(92,000)
12 months or greater Fair Value	1,164,000	1,689,000
12 months or greater Unrealized Loss	(141,000)	(227,000)
Total Fair Value	1,997,000	2,672,000
Total Unrealized Loss	$ (227,000)	$ (319,000)