Note 11 - Equity - Summary of Repurchases of Common Stock (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018		Sep. 30, 2018		Jun. 30, 2018		Mar. 31, 2018		Dec. 31, 2018
Total Number of Shares Purchased (in shares)							383,801		383,801
Average Price Paid Per Share (in dollars per share)							$ 15.50		$ 15.50
Maximum Approximate Dollar Value of Shares That May Yet Be Purchased Under the Program	$ 29,933,055						$ 29,933,055		$ 29,933,055
Total Number of Shares Purchased (in shares)							383,801		383,801
Publicly Announced Share Repurchase Program [Member]
Total Number of Shares Purchased (in shares)		[1]		[1]		[1]	383,801	[1]	383,801
Total Number of Shares Purchased (in shares)		[1]		[1]		[1]	383,801	[1]	383,801

[1] Represents shares repurchased through the Company's Share Repurchase Program publicly announced in November 2017.