Note 6 - Summary of Other Long-term Liabilities (Details) (Parathetical) - USD ($) $ in Millions	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Other Long Term Liabilities [Line Items]
Other long-term liabilities	$ 7		$ 17
ASU 2016-02 [Member]
Other Long Term Liabilities [Line Items]
Other long-term liabilities		$ 14