Note 6 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($) $ / shares shares
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares	$ 0.10
Treasury Stock, Value, Acquired, Cost Method	$ 25
Treasury Stock, Shares, Acquired (in shares) | shares	1,483,742
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 102