Note 7 - Debt, Credit Facility and Leases - Future Payments of Long-term Debt and Finance and Operating Leases (Details) $ in Thousands	Mar. 31, 2021 USD ($)
2022, finance leases	$ 7,329
2022, operating leases	3,696
2023, finance leases	5,132
2023, operating leases	2,706
2024, finance leases	3,643
2024, operating leases	2,002
2025, finance leases	2,076
2025, operating leases	549
2026, finance leases	0
2026, operating leases	525
Thereafter, finance leases	0
Thereafter, operating leases	2,213
Total, finance leases	18,180
Total, operating leases	11,691
Senior Notes [Member] | The 2028 Senior Notes [Member]
2022	34,438
2023	34,438
2024	34,438
2025	34,438
2026	34,438
Thereafter	539,568
Total	711,758
Senior Notes [Member] | IQ Notes [Member]
2022	2,499
2023	2,499
2024	2,499
2025	2,499
2026	39,045
Thereafter	0
Total	$ 49,041