Note 8 - Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Jan. 01, 2019
2020, finance leases	$ 359
2020, operating leases	877
2020, total	1,236
2021, finance leases	1,424
2021, operating leases	3,387
2021, total	4,811
2022, finance leases	1,100
2022, operating leases	2,902
2022, total	4,002
2023, finance leases	451
2023, operating leases	2,883
2023, total	3,334
2024, finance leases	31
2024, operating leases	2,906
2024, total	2,937
2025 and thereafter, finance leases	4
2025 and thereafter, operating leases	20,119
2025 and thereafter, total	20,123
Total lease payments, finance leases	3,369
Total lease payments, operating leases	33,074
Total lease payments, total	36,443
Less—portion representing interest, finance leases	(339)
Less—portion representing interest, operating leases	(11,957)
Less—portion representing interest, total	(12,296)
Present value of lease obligations, finance leases	3,030
Present value of lease obligations, operating leases	21,117		$ 19,508
Present value of lease obligations, total	24,147
Less—current portion of lease obligations, finance leases	(1,174)	$ (546)
Less—current portion of lease obligations, operating leases	(1,588)	(1,326)
Less—current portion of lease obligations, total	(2,762)
Long-term portion of lease obligations, finance leases	1,856	673
Long-term portion of lease obligations, operating leases	19,529	$ 16,591
Long-term portion of lease obligations, total	$ 21,385