Note 13 - Subsequent Event (Details Textual) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended
	Apr. 30, 2020	Mar. 31, 2020
Treasury Stock, Value, Acquired, Cost Method		$ 6
Repurchase Authorization 2019 [Member]
Treasury Stock, Shares, Acquired (in shares)		500,923
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)		$ 11.39
Treasury Stock, Value, Acquired, Cost Method		$ 6
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 123
Repurchase Authorization 2019 [Member] | Subsequent Event [Member]
Treasury Stock, Shares, Acquired (in shares)	404,913
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 10.57
Treasury Stock, Value, Acquired, Cost Method	$ 4
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 119