Note 8 - Leases (Details Textual) |
9 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
|
Sep. 30, 2019
USD ($)
|
Sep. 30, 2018
USD ($)
|
Dec. 31, 2018
USD ($)
|
Dec. 31, 2017
USD ($)
|
|
| Note To Financial Statement Details Textual | ||||
| Operating Lease, Expense | $ 282,000 | $ 174,000 | $ 232,000 | $ 225,000 |
| Finance Lease, Liability, Total | $ 0 | |||
| Lessee, Operating Lease, Not yet Commenced | 0 | |||
| Lessee, Finance Lease, Not yet Commenced | 0 | |||
| Sublease Income | $ 104,000 | |||