Note 9 - Debt, Credit Facility and Leases - Debt Summary (Details) - Senior Notes [Member] $ in Thousands, $ in Millions	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jul. 09, 2020 CAD ($)
Principal	$ 513,051	$ 512,886
Unamortized discount/premium and issuance costs	(4,956)	(5,644)
Long-term debt balance	508,095	507,242
The 2028 Senior Notes [Member]
Principal	475,000	475,000
Unamortized discount/premium and issuance costs	(5,552)	(6,462)
Long-term debt balance	469,448	468,538
IQ Notes [Member]
Principal	38,051	37,886
Unamortized discount/premium and issuance costs	596	818
Long-term debt balance	$ 38,647	$ 38,704	$ 48.2