R. Other Risks and Concentrations (Details) - USD ($)	12 Months Ended
	May 31, 2017	May 31, 2016
Investment Advisory Fees	$ 81,918	$ 109,194
Customer Group 1 [Member]
Surety Premium	85,000	116,000
Investment Advisory Fees	0	0
Customer Group 2 [Member]
Surety Premium	169,000	190,000
Investment Advisory Fees	16,000	17,000
Customer Group 3 [Member]
Surety Premium	175,000	180,000
Investment Advisory Fees	3,000	3,000
Customer Group 4 [Member]
Surety Premium	205,000	205,000
Investment Advisory Fees	4,000	4,000
Customer [Member]
Surety Premium	634,000	691,000
Investment Advisory Fees	$ 23,000	$ 24,000