Note 16 - Commitments and Contingencies - Future Minimum Payments Required Under the License Agreements (Details) $ in Thousands	Dec. 31, 2018 USD ($)
License agreements, future minimum payments due in 2019	$ 262
Purchase obligations, future minimum payments due in 2019	8,723
License agreements and purchase obligations, future minimum payments due in 2019	8,985
License agreements, future minimum payments due in 2020	134
Purchase obligations, future minimum payments due in 2020
License agreements and purchase obligations, future minimum payments due in 2020	134
License agreements, future minimum payments due in 2021	59
Purchase obligations, future minimum payments due in 2021
License agreements and purchase obligations, future minimum payments due in 2021	59
License agreements, future minimum payments due in 2022	59
Purchase obligations, future minimum payments due in 2022
License agreements and purchase obligations, future minimum payments due in 2022	59
License agreements, future minimum payments due in 2023	59
Purchase obligations, future minimum payments due in 2023
License agreements and purchase obligations, future minimum payments due in 2023	59
License agreements, future minimum payments due thereafter	695
Purchase obligations, future minimum payments due thereafter
License agreements and purchase obligations, future minimum payments due thereafter	695
License agreements, future minimum payments due	1,268
Purchase obligations, future minimum payments due	8,723
License agreements and purchase obligations, future minimum payments due	$ 9,991