Note 9 - Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	9 Months Ended
	Aug. 18, 2015	Aug. 15, 2015	Aug. 31, 2015	Sep. 30, 2015	Sep. 30, 2014	Aug. 19, 2015	Aug. 14, 2015	Dec. 31, 2014
IPO [Member] | Chief Executive Officer [Member]
Stock Issued During Period, Shares, New Issues		100,000	100,000
IPO [Member]
Stock Issued During Period, Shares, New Issues		3,300,000	3,300,000
Shares Issued, Price Per Share		$ 10.50	$ 10.50
Proceeds from Issuance of Common Stock		$ 30,700
Payments for Underwriting Discounts and Commisions		2,400
Payments for Other Stock Issuance Expenses		1,500
Revolving Credit Facility [Member]
Repayments of Lines of Credit		17,000
Preferred Stock [Member]
Stock Issued During Period, Shares, New Issues					66,000
Shares Issued, Price Per Share					$ 10
Payments of Dividends	$ 6,300	$ 6,300
Preferred Stock, Shares Outstanding				0	66,000	0		60,000
Common Stock, Shares, Issued				7,644,492	7,644,492			3,995,013
Common Stock, Shares, Outstanding				7,644,492	3,995,013			3,995,013
Proceeds from Issuance of Common Stock				$ 36,066	$ 16,045
Common Stock, Shares Authorized				100,000,000			100,000,000	12,240,000
Preferred Stock, Shares Authorized				0			10,000,000	1,000,000
Temporary Equity, Shares Authorized							60,600
Preferred Stock, Shares Issued				0	66,000			60,600