Note 13 - Leases (Details Textual) - European Headquarters Facility [Member] $ in Millions		12 Months Ended
	Oct. 09, 2015 ft²	Sep. 30, 2016 USD ($)
Area of Real Estate Property | ft²	33,000
Lessee Leasing Arrangements, Term of Contract	15 years
Lessee Leasing Arrangements, Number of Renewal Terms	3
Lessee Leasing Arrangements, Renewal Term	6 years
Lessee Leasing Arrangements Ability to Withdraw With Penalty	6 years
Lessee Leasing Arrangements Ability to Withdrawn Without Penalty	9 years
Lessee Leasing Arrangements Initial Yearly Rent		$ 0.4
Construction in Progress, Gross		2.4
Build-to-suit Lease Agreement, Offsetting Facility Lease Obligation		$ 1.9