Note 5 - Goodwill and Other Intangible Assets (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Sep. 30, 2017
Amortization of Intangible Assets, Total	$ 217,257	$ 29,091	$ 564,197	$ 367,253
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months			379,030
Finite-Lived Intangible Assets, Amortization Expense, Year Two			379,030
Finite-Lived Intangible Assets, Amortization Expense, Year Three			379,030
Finite-Lived Intangible Assets, Amortization Expense, Year Four			339,030
Finite-Lived Intangible Assets, Amortization Expense, Year Five			339,030
Finite-Lived Intangible Assets, Amortization Expense, after Year Five			$ 2,517,052
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life			1 year
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life			15 years