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Note 19 - Business Segments (Restated) - Reconciling Information Between Reportable Segments and Consolidated Totals (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues $ 166,365 $ 157,185 $ 179,364 $ 189,898 $ 166,519 $ 184,617 $ 159,861 $ 151,594 $ 692,812 [1] $ 662,591 [1] $ 594,644 [1]
Operating income 48,400 43,970 53,152 59,496 51,229 48,223 51,887 50,543 205,018 201,882 164,061
Interest income 127 255 362 244 140 266 245 320 988 971 297
Interest expense, net (12,987) (11,692) (14,540) (14,923) (15,828) (17,137) (18,401) (16,023) (54,142) (67,389) (72,577)
Derivatives and foreign currency transaction gains (losses) 614 (1,001) 1,703 1,338 (2,942) (222) (4,332) 1,962 2,654 (5,534) (1,622)
Income attributable to sale of tax benefits 3,859 3,506 4,356 6,157 4,123 3,463 4,519 4,398 17,878 16,503 25,431
Other non-operating income (expense), net 12 (1,592) 6 (92) (39) (5,546) 49 191 (1,666) (5,345) (1,991)
Income (loss) from continuing operations, before income taxes and equity in income (losses) of investees $ 40,025 $ 33,446 $ 45,039 $ 52,220 $ 36,683 $ 29,047 $ 33,967 $ 41,391 170,730 141,088 113,599
Intersegment Eliminations [Member]                      
Revenues                 109,040 56,075 48,559
Consolidation, Eliminations [Member]                      
Revenues                 $ (109,040) $ (56,075) $ (48,559)
[1] Revenues as reported in the geographic area in which they originate.