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Note 6 - Leases (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lessee, Operating Lease, Renewal Term (Year) 10 years  
Operating Lease, Expense $ 37,788 $ 32,161
Minimum [Member]    
Lessee, Operating Lease, Remaining Lease Term (Year) 1 year  
Maximum [Member]    
Lessee, Operating Lease, Remaining Lease Term (Year) 11 years