Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Feb. 29, 2020	Aug. 31, 2019
Trade receivable excluding joint ventures, allowance for doubtful accounts	$ 65,000	$ 65,000
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	10,000	10,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.02	$ 0.02
Common stock, shares authorized (in shares)	15,000,000	15,000,000
Common stock, shares issued (in shares)	9,097,236	9,086,816
Common stock, shares outstanding (in shares)	9,097,236	9,086,816