Note 8 - Federal Funds Purchased and Other Short-term Borrowings (Details) - Federal Funds Purchased and Other Short-term Borrowings - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Federal Funds Purchased and Other Short-term Borrowings [Abstract]
Federal funds purchased and securities sold under agreement to repurchase	$ 34,353	$ 28,590
Total short-term	34,353	28,590
Average balance during the year	31,580	30,428
Maximum month-end balance during the year	$ 39,474	$ 33,568
Average interest rate during the year	0.16%	0.18%
Average interest rate at year-end	0.24%	0.16%