Note 7 - Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Net income attributable to common shareholders	$ 10,671	$ 145,630	$ 227,832	$ 169,624
Basic weighted average shares (in shares)	10,153,571	10,092,319	10,143,903	10,080,729
Effect of dilutive securities:
Stock options (in shares)	2,855		1,209
Diluted weighted average shares (in shares)	10,156,426	10,092,319	10,145,112	10,080,729
Earnings per common share:
Basic (in dollars per share)	$ 0	$ 0.01	$ 0.02	$ 0.02
Diluted (in dollars per share)	$ 0	$ 0.01	$ 0.02	$ 0.02