Note 9 - Debt, Credit Facility and Leases (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

	December 31, 2021
	Senior Notes			IQ Notes		Total
Principal	$	475,000		$	38,051	$	513,051
Unamortized discount/premium and issuance costs		(5,552	)		596		(4,956	)
Long-term debt balance	$	469,448		$	38,647	$	508,095

	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 [Table Text Block]

	Senior Notes		IQ Notes
2022	$	34,438	$	2,479
2023		34,438		2,479
2024		34,438		2,479
2025		34,438		39,342
2026		34,438		—
2027		34,438		—
2028		479,302		—
Total	$	685,930	$	46,779

Schedule of Line of Credit Facilities [Table Text Block]

Interest rates:
Spread over the London Interbank Offered Rate		2.25 - 4.00	%
Spread over alternative base rate		1.25 - 3.00	%
Standby fee per annum on undrawn amounts		0.5625 - 1.00	%
Covenant financial ratios:
Senior leverage ratio (debt secured by liens/EBITDA)	not more than 2.50:1
Leverage ratio (total debt less unencumbered cash/EBITDA)	not more than 4.00:1
Interest coverage ratio (EBITDA/interest expense)	not less than 3.00:1

Finance Lease, Liability, Fiscal Year Maturity [Table Text Block]

Twelve-month period ending December 31,
2022	$	6,097
2023		4,422
2024		3,156
2025		556
Total		14,231
Less: imputed interest		(843	)
Net finance lease obligation	$	13,388

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Twelve-month period ending December 31,
2022	$	3,153
2023		3,011
2024		1,084
2025		1,058
2026		1,059
More than 5 years		6,418
Total		15,783
Effect of discounting		(3,347	)
Operating lease liability	$	12,436