Note 12 - Other Borrowings - Other Borrowings (Details) (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Line of Credit Facility, Maximum Borrowing Capacity	$ 14,750	$ 14,750
London Interbank Offered Rate (LIBOR) [Member]
Floating rate	1.95%	1.95%
London Interbank Offered Rate (LIBOR) [Member] | Notes Payable to Banks [Member]
Floating rate	1.95%	1.95%
Minimum [Member]
Federal Home Loan Bank advances, rates	1.30%	1.30%
Maximum [Member]
Federal Home Loan Bank advances, rates	5.57%	5.57%