Note 13 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value Recurring Basis (Details) - USD ($)	May 31, 2018	Aug. 31, 2017
Available for sale securities	$ 3,282,915	$ 3,766,984
Fair Value, Inputs, Level 1 [Member]
Available for sale securities	3,282,915	3,766,984
Fair Value, Inputs, Level 2 [Member]
Available for sale securities
Fair Value, Inputs, Level 3 [Member]
Available for sale securities