Note 16 - Accelerated Share Repurchases (Details Textual) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands					8 Months Ended	12 Months Ended
	Jan. 17, 2020	Jan. 17, 2020	May 08, 2019	May 07, 2019	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 14, 2020	May 02, 2019
Stock Repurchase Program, Authorized Amount										$ 50,000
Payments for Repurchase of Common Stock						$ (0)	$ (0)	$ 30,000
Accelerated Stock Repurchase [Member]
Stock Repurchase Program, Authorized Amount				$ 30,000						30,000
Payments for Repurchase of Common Stock				$ 30,000
Stock Repurchased During Period, Shares (in shares)			500
Share Price (in dollars per share)			$ 39.85
Share Repurchased, Pecentage			60.00%
Stock Repurchase Program, Remaining Authorized Repurchase Amount									$ 12,000
Accelerated Stock Repurchase [Member] | Morgan Stanley & Co., LLC [Member]
Number of Additional Shares Deliver to Company if ASR Agreement Settled (in shares)		100
Stock Repurchased and Retired During Period, Shares (in shares)	600
Accelerated Share Repurchases, Final Price Paid Per Share (in dollars per share)	$ 50.78
Repurchase from Open Market [Member]
Stock Repurchase Program, Authorized Amount										$ 20,000
Treasury Stock, Shares, Acquired (in shares)					0