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Note 9 - Leases (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Operating Lease, Right-of-Use Asset   $ 30,813 $ 7,683  
Finance Lease, Right-of-Use Asset, Accumulated Amortization   1,300 900  
Operating Leases, Rent Expense, Net, Total $ 2,700      
Operating Lease, Liability, Total   $ 30,115 $ 7,889  
Accounting Standards Update 2016-02 [Member]        
Operating Lease, Right-of-Use Asset       $ 8,000
Operating Lease, Liability, Total       $ 8,000