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