Note 11 - Leases (Details Textual) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Lessee Lease Description [Line Items]
Operating lease right-of-use asset	$ 36,474
Short term operating lease liabilities	2,937
Long term operating lease liabilities	33,840
Finance lease right-of-use asset	3,471
Short term finance lease liabilities	1,118
Long term finance lease liabilities	$ 1,132
Manufacturing, Office and Warehouse Space [Member]
Lessee Lease Description [Line Items]
Operating lease existence of option to extend	true
Manufacturing, Office and Warehouse Space [Member] | Minimum [Member]
Lessee Lease Description [Line Items]
Operating lease renewal term	3 years
Manufacturing, Office and Warehouse Space [Member] | Maximum [Member]
Lessee Lease Description [Line Items]
Operating lease renewal term	5 years
Manufacturing and Office Facilities [Member] | Colorado [Member]
Lessee Lease Description [Line Items]
Lease expiration date	May 31, 2025
Lessee operating lease renewal description	The lease expires in May 2025 and includes two five year extension options at prevailing market rates.
Operating lease expense	$ 1,700
Manufacturing and Office Facilities [Member] | North Carolina [Member]
Lessee Lease Description [Line Items]
Lease expiration date	Mar. 31, 2023
Lessee operating lease renewal description	The lease expires in March 2023 and includes one five year extension option at prevailing market rates.
Operating lease expense	$ 1,300
Office Space [Member] | New Jersey [Member]
Lessee Lease Description [Line Items]
Lease expiration date	Nov. 30, 2029
Lessee operating lease renewal description	This lease includes one five year extension option at prevailing market rates but at this time, the expiration date is too far in the future to be reasonably certain that the lease will be extended.
Operating lease expense	$ 400