Note 7 - Leases - Future Commitments Under Long-Term Leases (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
2020	$ 285
2020	623
2020	908
2021	264
2021	498
2021	762
2022	168
2022	425
2022	593
2023	37
2023	238
2023	275
2024	22
2024	96
2024	118
Thereafter	435
Thereafter
Thereafter	435
Total lease payments, Finance Lease	1,211
Total lease payments, Operating Lease	1,880
Total lease payments	3,091
Less imputed interest	338
Less imputed interest	154
Less imputed interest	492
Total	873	$ 924
Operating Lease, Liability, Total	1,726
Total	2,599
Less: current portion of obligations under leases	247	236
Less: current portion of obligations under leases	551
Less: current portion of obligations under leases	798
Long-term portion of obligations under leases	626	688
Long-term portion of obligations under leases	1,175
Long-term portion of obligations under leases	$ 1,801