Note 1 - Summary of Impact of Adoption on Consolidated Statement of Financial Position (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Basis Of Presentation And Recent Accounting Pronouncements [Line Items]
Operating lease right-of-use assets	$ 49
Operating lease liabilities	60
Deferred rent payable			$ 10
Deferred gain on previous sale leaseback transaction			6
Net fixed assets from previous sale leaseback transaction			1
Accumulated deficit	$ 79		$ 200
ASU 2016-02 [Member]
Basis Of Presentation And Recent Accounting Pronouncements [Line Items]
Operating lease right-of-use assets		$ 51
Operating lease liabilities		61
Accumulated deficit		195
ASU 2016-02 [Member] | Adjustments Due to ASU 2016-02 [Member]
Basis Of Presentation And Recent Accounting Pronouncements [Line Items]
Operating lease right-of-use assets		51
Operating lease liabilities		61
Deferred rent payable		(10)
Deferred gain on previous sale leaseback transaction		(6)
Net fixed assets from previous sale leaseback transaction		(1)
Accumulated deficit		$ (5)