Note 7 - Debt, Credit Facility and Leases - Future Payments of Long-term Debt and Finance and Operating Leases (Details) $ in Thousands	Jun. 30, 2021 USD ($)
2022, finance leases	$ 6,793
2022, operating leases	3,423
2023, finance leases	4,637
2023, operating leases	2,619
2024, finance leases	3,447
2024, operating leases	1,514
2025, finance leases	1,276
2025, operating leases	541
2026, finance leases	0
2026, operating leases	524
Thereafter, finance leases	0
Thereafter, operating leases	2,084
Total, finance leases	16,153
Total, operating leases	10,705
Senior Notes [Member] | The 2028 Senior Notes [Member]
2022	34,438
2023	34,438
2024	34,438
2025	34,438
2026	34,438
Thereafter	530,958
Total	703,148
Senior Notes [Member] | IQ Notes [Member]
2022	2,536
2023	2,536
2024	2,536
2025	2,536
2026	38,980
Thereafter	0
Total	$ 49,124