Note 5 - Property and Equipment (Details Textual) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2019 |
Jun. 30, 2018 |
|
| Depreciation, Nonproduction | $ 0.1 | $ 0.1 | $ 0.2 | $ 0.2 |
| X | ||||||||||
- Definition The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|