Note 13 - Earnings Per Common Share - Summary of Earnings Per Share Calculation (Details) - USD ($)	3 Months Ended												12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	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, 2017	Sep. 30, 2016	Sep. 30, 2015
Basic Income (Loss) Per Share
Income (Loss) available to common stockholders													$ 1,408,396	$ 4,632,848	$ (122,377)
Shares denominator (in shares)													2,874,926	1,943,625	1,638,215
Per share amount (in dollars per share)	$ 0.20	$ 0.33	$ 0.07	$ (0.11)	$ 1.81	$ (0.01)	$ (0.28)	$ (0.03)	$ 0.19	$ 0.07	$ (0.17)	$ (0.17)	$ 0.49	$ 2.38	$ (0.07)
Effect of Dilutive Securities
Shares denominator (in shares)													2,874,926	1,943,625	1,638,215
Options and warrants under convertible note (in shares)													194,151	16,496
(in shares)													3,069,077	1,960,121	1,638,215
Diluted Income (Loss) Per Share
Income (Loss) available to common stockholders													$ 1,408,396	$ 4,632,848	$ (122,377)
Per share amount (in dollars per share)	$ 0.18	$ 0.31	$ 0.07	$ (0.11)	$ 1.77	$ (0.01)	$ (0.28)	$ (0.03)	$ 0.19	$ 0.07	$ (0.17)	$ (0.17)	$ 0.46	$ 2.36	$ (0.07)