Note 8 - Federal Funds Purchased and Other Short-term Borrowings - Federal Funds Purchased and Other Short-term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Federal funds purchased and short-term securities sold under agreements to repurchase	$ 35,085	$ 34,353
Total short-term	35,085	34,353
Average balance during the year	36,919	31,580
Maximum month-end balance during the year	$ 41,397	$ 39,474
Average interest rate during the year	0.27%	0.16%
Average interest rate at year-end	0.35%	0.24%