Note 9 - Operating Leases (Details Textual) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Operating Lease, Weighted Average Discount Rate, Percent	9.50%	9.50%
Operating Lease, Expense	$ 0.6	$ 1.7
Lessee, Operating Lease, Renewal Term	5 years	5 years
Operating Lease, Payments	$ 0.5	$ 1.5
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term		1 year
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term		11 years