Note 6 - Long-term Leases - Lease Information and Expense (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Finance (Year)	4 years 2 months 12 days
Operating (Year)	7 years 1 month 6 days
Finance	6.00%
Operating	6.00%
Depreciation of leased assets	$ 3,889
Interest of lease liabilities	1,306
Total finance lease costs	5,195
Operating lease costs	35,881
Variable lease costs	3,587
Short-term lease costs	1,050
Total operating lease costs	40,518
Total lease costs	$ 45,713