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Note 11 - Leases (Details Textual) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Lessee Lease Description [Line Items]    
Operating Lease Expense   $ 21
Operating Lease Expense, Sublease Income   $ 7
Net investment in sales-type leases $ 4  
Income recognized for sales-type lease arrangements $ 0  
Minimum [Member]    
Lessee Lease Description [Line Items]    
Net investment in sales-type leases period 1 year