Note 13 - Income Taxes - Operating Carryforwards (Details) $ in Millions	Dec. 31, 2020 USD ($)
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	$ 94
Operating Loss Carryforwards, Amount Subject to Expiration	60
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	57
Operating Loss Carryforwards, Amount Subject to Expiration	$ 36