Note 9 - Assets Available for Sale (Details Textual) - USD ($)		1 Months Ended	9 Months Ended
	Feb. 10, 2016	Dec. 31, 2015	Aug. 31, 2016	Aug. 31, 2015
Ames, Iowa Production Facility [Member]
Proceeds from Sale of Property, Plant, and Equipment	$ 1,192,000
Gain (Loss) on Disposition of Property Plant Equipment	$ 36,000
Monona, Iowa Storage Facility [Member]
Gain (Loss) on Disposition of Property Plant Equipment		$ 4,000
Proceeds from Sale of Property, Plant, and Equipment			$ 1,173,492	$ 20,906
Gain (Loss) on Disposition of Property Plant Equipment			$ 26,473	$ 1,130