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Note 7 - Leases - Future Commitments Under Long-Term Leases (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
2020 | $ 285 |
2020 | 593 |
2020 | 878 |
2021 | 251 |
2021 | 496 |
2021 | 747 |
2022 | 72 |
2022 | 343 |
2022 | 415 |
2023 | 33 |
2023 | 175 |
2023 | 208 |
2024 | 20 |
2024 | 31 |
2024 | 51 |
Thereafter | 435 |
Thereafter |  |
Thereafter | 435 |
Total lease payments, Finance Lease | 1,096 |
Total lease payments, Operating Lease | 1,638 |
Total lease payments | 2,734 |
Less imputed interest | 331 |
Less imputed interest | 133 |
Less imputed interest | 464 |
Total | 765 | $ 924
Operating Lease, Liability, Total | 1,505 |
Total | 2,270 |
Less: current portion of obligations under leases | 250 | 236
Less: current portion of obligations under leases | 528 |
Less: current portion of obligations under leases | 778 |
Long-term portion of obligations under leases | 515 | 688
Long-term portion of obligations under leases | 977 |
Long-term portion of obligations under leases | $ 1,492 |

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