Note 14 - Income Taxes - Reconciliation of the Total Amounts of Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	Aug. 31, 2019	Aug. 31, 2018
Gross unrecognized tax benefits – beginning balance	$ 242,000	$ 250,000
Gross decreases – prior period tax positions	1,000	(12,000)
Gross increases – current period tax positions	5,000	4,000
Gross unrecognized tax benefits – ending balance	$ 248,000	$ 242,000