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Note 2 - Acquisitions and Divestitures - Business Acquisition Income Statement Supplemental Information of Valley Forge Convention Center Partners (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net income from continuing operations, net of tax $ 83,287 $ 38,116 $ (108,544) $ (147,559) $ 24,296 $ 39,405 $ 48,484 $ 45,451   $ (134,700) $ 157,636 $ 115,048
Valley Forge Convention Center Partners, L.P. [Member]                        
Total revenues                 $ 43,499 88,699 168,610  
Net income from continuing operations, net of tax                 $ 4,450 $ 3,342 $ 31,286