Note 1 - Nature of Business and Significant Accounting Policies - Property and Equipment, Useful Life (Details)	12 Months Ended
	Aug. 31, 2019
Building and Building Improvements [Member] | Minimum [Member]
Property and equipment (Year)	5 years
Building and Building Improvements [Member] | Maximum [Member]
Property and equipment (Year)	30 years
Machinery and Equipment [Member] | Minimum [Member]
Property and equipment (Year)	3 years
Machinery and Equipment [Member] | Maximum [Member]
Property and equipment (Year)	10 years