Investments - Schedule of Unrealized Loss Breakdown by Investment (Details) - USD ($)	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Less than 12 months Fair Value	$ 2,403,000	$ 8,174,000
Less than 12 months Unrealized Loss	(111,000)	(540,000)
12 months or greater Fair Value	3,008,000	1,807,000
12 months or greater Unrealized Loss	(306,000)	(189,000)
Total Fair Value	5,411,000	9,981,000
Total Unrealized Loss	(417,000)	(729,000)
Municipal Bonds [Member]
Less than 12 months Fair Value	1,420,000	3,129,000
Less than 12 months Unrealized Loss	(19,000)	(215,000)
12 months or greater Fair Value	1,292,000	609,000
12 months or greater Unrealized Loss	(78,000)	(24,000)
Total Fair Value	2,712,000	3,738,000
Total Unrealized Loss	(97,000)	(239,000)
REITs [Member]
Less than 12 months Fair Value		27,000
Less than 12 months Unrealized Loss		(2,000)
12 months or greater Fair Value	27,000
12 months or greater Unrealized Loss	(1,000)
Total Fair Value	27,000	27,000
Total Unrealized Loss	(1,000)	(2,000)
Equity Securities [Member]
Less than 12 months Fair Value	983,000	5,018,000
Less than 12 months Unrealized Loss	(92,000)	(323,000)
12 months or greater Fair Value	1,689,000	1,171,000
12 months or greater Unrealized Loss	(227,000)	(161,000)
Total Fair Value	2,672,000	6,189,000
Total Unrealized Loss	$ (319,000)	(484,000)
Corporate Bonds [Member]
Less than 12 months Fair Value
Less than 12 months Unrealized Loss
12 months or greater Fair Value		27,000
12 months or greater Unrealized Loss		(4,000)
Total Fair Value		27,000
Total Unrealized Loss		$ (4,000)