Note 11 - Earnings Per Common Share - Summary of Earnings Per Share Calculation (Details) - USD ($)	3 Months Ended												12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Basic Income (Loss) Per Share
Income (Loss) available to common stockholders													$ 4,632,848	$ (122,377)	$ 8,376
Shares denominator (in shares)													1,943,625	1,638,215	1,638,215
Per share amount (in dollars per share)	$ 2.70	$ (0.01)	$ (0.28)	$ (0.03)	$ 0.19	$ 0.07	$ (0.17)	$ (0.17)	$ 0.15	$ 0.24	$ (0.18)	$ (0.20)	$ 2.38	$ (0.07)	$ 0.01
Effect of Dilutive Securities
Average shares outstanding (in shares)													1,943,625	1,638,215	1,638,215
Options available under convertible note (in shares)															31,097
(in shares)													1,943,625	1,638,215	1,669,312
Diluted Income (Loss) Per Share
Income (Loss) available to common stockholders													$ 4,632,848	$ (122,377)	$ 8,376
Per share amount (in dollars per share)	$ 2.70	$ (0.01)	$ (0.28)	$ (0.03)	$ 0.19	$ 0.07	$ (0.17)	$ (0.17)	$ 0.14	$ 0.23	$ (0.18)	$ (0.20)	$ 2.38	$ (0.07)	$ 0.01