Note 6 - Related Party Transactions (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
	Feb. 08, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Stock Issued During Period, Shares, New Issues	3,285,550
Shares Issued, Price Per Share	$ 7
Directors, Executive Officers and Their Related Parties [Member]
Related Party Deposit Liabilities		$ 92,400		$ 115,500
Related Party Deposit Liabilities, Increase (Decrease)		(23,100)
Related Party Transactions, Interest Paid on Deposits		119	$ 84
Related Party Transaction, Expenses from Transactions with Related Party		528	553
Related Party Transaction, Subordinated Debt, Accelerated Partial Principal Repayment	$ 5,000
Related Party Transaction, Interest Paid	$ 3,100
Related Party Transactions, Subordinated Debt				$ 3,100
Interest Expense, Related Party		27	$ 35
Stock Issued During Period, Shares, New Issues	339,886
Shares Issued in Transaction as a Percentage of Total Shares Issued	10.30%
Directors, Executive Officers and Their Related Parties [Member] | Nonperforming Financial Instruments [Member]
Due from Related Parties, Total		$ 0