Note 20 - Stock Repurchase Program (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		8 Months Ended	14 Months Ended
	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Jun. 30, 2020	May 07, 2019
Treasury Stock, Value, Acquired, Cost Method		$ 23,008	$ 12,880	$ 31,609
May 2019 Repurchase Program [Member]
Stock Repurchase Program, Authorized Amount							$ 50,000
Treasury Stock, Shares, Acquired (in shares)	400,000				741,934	1,141,934
Treasury Stock, Value, Acquired, Cost Method	$ 12,900				$ 26,400	$ 39,300
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 32.20				$ 35.59	$ 34.40
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 10,700			$ 10,700