Note 13 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value Recurring Basis (Details) - USD ($)	May 31, 2019	Aug. 31, 2018
Available for sale securities	$ 2,540,613	$ 3,300,110
Fair Value, Inputs, Level 1 [Member]
Available for sale securities	2,540,613	3,300,110
Fair Value, Inputs, Level 2 [Member]
Available for sale securities
Fair Value, Inputs, Level 3 [Member]
Available for sale securities