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Note 9 - Debt, Credit Facility and Leases - Annual Future Obligations Related to the Senior Notes (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
2020 (interest and fees only)	$ 36,455
2021 (principal and interest)	557,841
2022 (principal)	50,000
Total	644,296
Less: interest and fees	(57,592)
Principal	586,704
Less: unamortized discount	(2,086)
Long-term debt	584,618	$ 532,799
Revolving Credit Facility [Member]
2020 (interest and fees only)	219
2021 (principal and interest)	0
2022 (principal)	50,000
Total	50,219
Less: interest and fees	(219)
Principal	50,000
Less: unamortized discount	0
Long-term debt	50,000
Senior Notes [Member]
2020 (interest and fees only)	34,822
2021 (principal and interest)	526,813
2022 (principal)	0
Total	561,635
Less: interest and fees	(55,135)
Principal	506,500
Less: unamortized discount	(2,086)
Long-term debt	504,414
Series 2018-A Senior Notes [Member]
2020 (interest and fees only)	1,414
2021 (principal and interest)	31,028
Total	32,442
Less: interest and fees	(2,238)
Principal	30,204
Less: unamortized discount	0
Long-term debt	$ 30,204

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Amount of long-term debt payable, sinking fund requirements, and other securities including interest issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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