Note 7 - Debt, Credit Facility and Leases (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Schedule of Long-term Debt Instruments [Table Text Block]

	March 31, 2021
	Senior Notes			IQ Notes		Total
Principal	$	475,000		$	38,359	$	513,359
Unamortized discount/premium and issuance costs		(6,234	)		867		(5,367	)
Long-term debt balance	$	468,766		$	39,226	$	507,992

	December 31, 2020
	Senior Notes			IQ Notes		Total
Principal	$	475,000		$	37,886	$	512,886
Unamortized discount/premium and issuance costs		(6,462	)		818		(5,644	)
Long-term debt balance	$	468,538		$	38,704	$	507,242

Schedule of Maturities of Long Term Debt and Finance and Operating Lease Liabilities [Table Text Block]

Twelve-month period ending March 31,	Senior Notes		IQ Notes		Finance Leases		Operating Leases
2022	$	34,438	$	2,499	$	7,329	$	3,696
2023		34,438		2,499		5,132		2,706
2024		34,438		2,499		3,643		2,002
2025		34,438		2,499		2,076		549
2026		34,438		39,045		—		525
Thereafter		539,568		—		—		2,213
Total	$	711,758	$	49,041	$	18,180	$	11,691