Note 15 - Lease Commitments and Purchase Obligations (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Operating Lease, Weighted Average Remaining Lease Term	4 years
Other Noncurrent Assets [Member]
Operating Lease, Right-of-Use Asset	$ 1,557
Other Current Liabilities [Member]
Operating Lease, Liability, Current	537
Other Noncurrent Liabilities [Member]
Operating Lease, Liability, Noncurrent	$ 1,020
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term	1 year
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term	5 years