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Note 16 - Condensed Consolidating Financial Information (Details Textual)
Dec. 31, 2019
Dec. 03, 2019
Dec. 31, 2018
Jun. 25, 2018
Mar. 28, 2016
Subsidiary [Member]          
Noncontrolling Interest, Ownership Percentage by Parent 100.00%        
Senior Notes [Member] | Senior Notes 6.375% Due 2026 [Member]          
Debt Instrument, Interest Rate, Stated Percentage 6.375%   6.375%   6.375%
Senior Notes [Member] | Senior Notes 6.000% Due 2026 [Member]          
Debt Instrument, Interest Rate, Stated Percentage 6.00%   6.00% 6.00%  
Senior Notes [Member] | The 4.750% Senior NotesDue December 2027 [Member]          
Debt Instrument, Interest Rate, Stated Percentage 4.75% 4.75% 4.75%