Note 5 - Goodwill and Other Intangible Assets (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Amortization of Intangible Assets	$ 217,257	$ 29,091	$ 367,253	$ 29,091	$ 0
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	466,530
Finite-Lived Intangible Assets, Amortization Expense, Year Two	179,030
Finite-Lived Intangible Assets, Amortization Expense, Year Three	179,030
Finite-Lived Intangible Assets, Amortization Expense, Year Four	179,030
Finite-Lived Intangible Assets, Amortization Expense, Year Five	155,697
Finite-Lived Intangible Assets, Amortization Expense, after Year Five	$ 737,081
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life	1 year
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life	15 years