Note 5 - Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		12 Months Ended
	Jan. 31, 2023	Oct. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Mar. 31, 2022	May 31, 2021	Jul. 31, 2015
Treasury Stock, Value, Acquired, Cost Method			$ 2,940	$ 40,655
Share Repurchase Program Authorized in July 2015 [Member]
Stock Repurchase Program, Authorized Amount							$ 25,000
Treasury Stock, Shares, Acquired (in shares)			0	0
Share Repurchase Program Authorized in May 2021 [Member]
Stock Repurchase Program, Authorized Amount						$ 6,000
Treasury Stock, Shares, Acquired (in shares)				236,159
Treasury Stock, Value, Acquired, Cost Method				$ 1,600
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)				$ 6.94
Dutch Auction Self-tender [Member]
Treasury Stock, Shares, Acquired (in shares)		4,300,000
Treasury Stock, Value, Acquired, Cost Method		$ 38,700
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)		$ 9.00
Share Repurchase Program Authorized in March 2022 [Member]
Stock Repurchase Program, Authorized Amount					$ 3,000
Treasury Stock, Shares, Acquired (in shares)			711,481
Treasury Stock, Value, Acquired, Cost Method			$ 2,900
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)			$ 4.13
Share Repurchase Program Authorized in March 2022 [Member] | Subsequent Event [Member]
Treasury Stock, Shares, Acquired (in shares)	25,096
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 4.09