Note 12 - Income Taxes (Details Textual) $ in Millions		3 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	$ 0.3
Unrecognized Tax Benefits	$ 0.4	$ 0.4
Valuation Allowance, Operating Loss Carryforwards [Member]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ (0.5)