Note 24 - Subsequent Events - (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets		$ 1,321,256	$ 1,105,841
Loans and Leases Receivable, Net of Deferred Income		975,284	810,951
Deposits		1,055,533	932,795
Stockholders' Equity Attributable to Parent		179,935	$ 113,559	$ 112,449	$ 78,845
Minden Bancorp [Member]
Assets		315,400
Loans and Leases Receivable, Net of Deferred Income		193,300
Deposits		264,000
Stockholders' Equity Attributable to Parent		$ 28,500
Subsequent Event [Member] | Minden Bancorp [Member]
Payments to Acquire Businesses, Gross	$ 56,200
Business Acquisition, Price Paid Per Share of Common Stock of Acquired Entity	$ 23.20