Note 3 - Common Stock Outstanding and Earnings Per Share (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended
	May 10, 2017	Jun. 30, 2017	Jun. 30, 2016
Proceeds from Issuance of Common Stock		$ 26,778
Public Offering [Member]
Share Price	$ 10.50
Stock Issued During Period, Shares, New Issues	2,738,096
Proceeds from Issuance of Common Stock	$ 26,800