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Note 8 - Leases - Future Commitments Under Long-term Leases (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
2022, finance | $ 368 |
2022, operating | 596 |
2022, total | 964 |
2023, finance | 163 |
2023, operating | 537 |
2023, total | 700 |
2024, finance | 111 |
2024, operating | 385 |
2024, total | 496 |
2025, finance | 103 |
2025, operating | 194 |
2025, total | 297 |
2026, finance | 41 |
2026, operating | 153 |
2026, total | 194 |
Thereafter, finance | 405 |
Thereafter, operating |  |
Thereafter, total | 405 |
Total lease payments, finance | 1,191 |
Total lease payments, operating | 1,865 |
Total lease payments, total | 3,056 |
Less imputed interest, finance | 312 |
Less imputed interest, operating | 139 |
Less imputed interest, total | 451 |
Total, finance | 879 | $ 893
Total, operating | 1,726 | 1,728
Total, total | 2,605 |
Less: current portion of obligations under leases, finance | 333 | 333
Less: current portion of obligations under leases, operating | 532 | 529
Less: current portion of obligations under leases, total | 865 |
Long-term portion of obligations under leases, finance | 546 | 560
Long-term portion of obligations under leases, operating | 1,194 | $ 1,199
Long-term portion of obligations under leases, total | $ 1,740 |

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