Note 15 - Common Stock (Details Textual) - USD ($) $ / shares in Units, $ in Millions									6 Months Ended
	Jun. 30, 2022	May 31, 2022	Apr. 30, 2022	Mar. 31, 2022		Feb. 28, 2022	Jan. 31, 2022		Jun. 30, 2022	Dec. 14, 2021	Aug. 26, 2021	Dec. 31, 2004
Treasury Stock, Shares, Acquired (in shares)	0	20,000	0	52,739		75,865	130,803		279,407
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 0	$ 3.15	$ 0	$ 4.36	[1]	$ 4.90	$ 5.08	[1]
Repurchase Plan [Member]
Stock Repurchase Program, Authorized Amount										$ 2	$ 2	$ 25
Treasury Stock, Shares, Acquired (in shares)	0	20,000	0	52,739		75,865	130,803		279,407
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)									$ 4.75

[1] Excludes broker commission.