Note 7 - Leases (Details Textual) xbrli-pure in Thousands |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
|
Jun. 30, 2019
USD ($)
|
Jun. 30, 2019
USD ($)
|
Jun. 30, 2018
USD ($)
|
Dec. 31, 2018
USD ($)
|
Dec. 31, 2017
USD ($)
|
|
| Operating Lease, Expense | $ 98,000 | $ 165,000 | $ 115,000 | $ 232,000 | $ 225,000 |
| Finance Lease, Liability, Total | $ 0 | $ 0 | |||
| Lessee, Operating Lease, Not yet Commenced | 0 | 0 | |||
| Lessee, Finance Lease, Not yet Commenced | 0 | 0 | |||
| Sublease Income | $ 42,000 | ||||