Note 8 - Leases - ROU Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Operating leases, other noncurrent assets	$ 16,924	$ 0
Finance Leases, Lease liability	5,943	251
Property, Plant and Equipment, Net [Member]
Finance leases, property, plant and equipment, net	9,665
Other Noncurrent Assets [Member]
Operating leases, other noncurrent assets	16,924
Accounts Payable and Accrued Liabilities [Member]
Operating leases, accounts payable and accrued liabilities	4,601	0
Long-term Debt, Current [Member]
Finance leases, current portion of long-term debt	589
Long-term Debt [Member]
Finance leases, long-term debt	5,354
Other Noncurrent Liabilities [Member]
Operating leases, noncurrent liabilities	11,146	$ 0
Accounts Payable and Accrued Liabilities and Other Noncurrent Liabilities [Member]
Operating leases, total	$ 15,747