Note 20 - Stock Repurchase Program (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended	5 Months Ended	9 Months Ended
	May 31, 2019	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2019	May 07, 2019
Treasury Stock, Value, Acquired, Cost Method		$ 4,692		$ 36,301
October 26, 2018 Stock Repurchase Program [Member]
Treasury Stock, Shares, Acquired	1,182,060
Treasury Stock, Value, Acquired, Cost Method	$ 45,000
Treasury Stock Acquired, Average Cost Per Share	$ 38.07
May 2019 Repurchase Program [Member]
Treasury Stock, Shares, Acquired			741,934
Treasury Stock, Value, Acquired, Cost Method			$ 26,400
Treasury Stock Acquired, Average Cost Per Share			$ 35.59
Stock Repurchase Program, Authorized Amount					$ 50,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 23,600	$ 23,600	$ 23,600