Note 9 - Short-term Borrowings (Details) - Short-term Borrowings - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Short-term Borrowings [Line Items]
Balance		$ 52,660	$ 37,163
Securities Sold under Agreements to Repurchase [Member]
Short-term Borrowings [Line Items]
Balance	[1]	45,339	37,163
Maximum indebtedness at any month end	[1]	45,339	37,163
Daily average indebtedness outstanding	[1]	$ 38,835	$ 31,364
Average rate paid for the year	[1]	0.37%	0.37%
Average rate on period-end borrowings	[1]	0.38%	0.37%
Other Short Term Debt [Member]
Short-term Borrowings [Line Items]
Balance	[2]	$ 7,321	$ 0
Maximum indebtedness at any month end	[2]	7,321	0
Daily average indebtedness outstanding	[2]	$ 1,365	$ 547
Average rate paid for the year	[2]	0.66%	0.34%
Average rate on period-end borrowings	[2]	0.77%	0.00%

[1] Securities sold under agreements to repurchase mature overnight. The repurchase agreements were collateralized by U.S. Government mortgage-backed securities and CMOs with an amortized cost of $52,920,000 and $47,309,000 and a fair value of $52,314,000 and $47,200,000 and at December 31, 2016 and 2015, respectively. These securities are held in safekeeping at the Federal Reserve Bank of Philadelphia.

[2] Other short-term borrowings include Federal funds purchased and overnight borrowings from the FHLB.