Note 13 - Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended			4 Months Ended	9 Months Ended
	Sep. 03, 2021	Aug. 09, 2021	Jun. 30, 2021	Mar. 31, 2021	Mar. 31, 2020	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Aug. 05, 2021	Jan. 25, 2021	Mar. 26, 2020	Feb. 10, 2020
Stock Repurchase Program, Authorized Amount									$ 40,000	$ 40,000		$ 20,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount								$ 38,000			$ 2,500
Treasury Stock, Shares, Acquired (in shares)						500,000	600,000	1,400,000
Treasury Stock, Value, Acquired, Cost Method			$ 249	$ 8,118	$ 17,515	$ 8,400	$ 10,300	$ 17,500
Dutch Tender Offer [Member]
Treasury Stock, Shares, Acquired (in shares)	86,132
Treasury Stock, Value, Acquired, Cost Method	$ 2,000
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 23.00
Maximum [Member] | Dutch Tender Offer [Member]
Stock Repurchase Program, Authorized Amount		$ 40,000
Stock Repurchase Program, Share Price (in dollars per share)		$ 23.00
Minimum [Member] | Dutch Tender Offer [Member]
Stock Repurchase Program, Share Price (in dollars per share)		$ 21.00