Note 8 - Leases (Details Textual) Pure in Thousands, $ in Thousands	Jun. 30, 2019 USD ($)	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Operating Lease, Liability, Total	$ 12,514
Operating Lease, Right-of-Use Asset	$ 12,249		$ 0
Lessee, Financial Lease, Liability, Number of Leases	0
Lessee, Operating Lease, Lease Not yet Commenced, Number of Leases	0
Minimum [Member] | Office Space, Manufacturing Facilities, and Certain Company Vehicles and Equipment [Member]
Lessee, Operating Lease, Term of Contract	1 year
Maximum [Member] | Office Space, Manufacturing Facilities, and Certain Company Vehicles and Equipment [Member]
Lessee, Operating Lease, Term of Contract	10 years
Accounting Standards Update 2016-02 [Member]
Operating Lease, Liability, Total		$ 13,100
Operating Lease, Right-of-Use Asset		$ 13,100