C. Investments (Details - Assets measured at fair value on a recurring basis) - USD ($)	May 31, 2017	May 31, 2016
Assets:
Total Assets	$ 42,470,142	$ 12,305,497
Fair Value, Measurements, Recurring [Member]
Assets:
Fixed income securities at fair value	33,546,645	7,230,261
Equity securities at fair value (includes derivatives)	2,422,476	1,488,440
Short-term investments at fair value	1,857,601	197,752
Total Assets	37,826,722	8,916,453
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Fixed income securities at fair value	0	0
Equity securities at fair value (includes derivatives)	2,422,476	1,488,440
Short-term investments at fair value	1,857,601	197,752
Total Assets	4,280,077	1,686,192
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Fixed income securities at fair value	33,546,645	7,230,261
Equity securities at fair value (includes derivatives)	0	0
Short-term investments at fair value	0	0
Total Assets	33,546,645	7,230,261
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Fixed income securities at fair value	0	0
Equity securities at fair value (includes derivatives)	0	0
Short-term investments at fair value	0	0
Total Assets	$ 0	$ 0