Note 9 - Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	9 Months Ended
	Aug. 26, 2020	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Stock Issued During Period, Shares, New Issues (in shares)		2,000,000	2,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)		$ 0.01	$ 0.01		$ 0.01
Proceeds from Issuance of Preferred Stock and Preference Stock			$ 48,325	$ 0
Series A Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues (in shares)	2,000,000
Preferred Stock, Dividend Rate, Percentage	7.00%
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01
Shares Issued, Price Per Share (in dollars per share)	$ 25.00
Proceeds from Issuance of Preferred Stock and Preference Stock	$ 48,300
Preferred Stock, Redemption Price Per Share (in dollars per share)	$ 3.00