Note 4 - Borrowings - Wholesale Repurchase Agreements (Details) - Whole sale Repurchase Agreements [Member] - USD ($)	Sep. 30, 2016	Dec. 31, 2015
2016
2016	0.00%	0.00%
Long-term Debt, Maturities, Repayments of Principal in Year Two	$ 10,000,000	$ 10,000,000
2017	3.07%	3.00%
Long-term Debt, Maturities, Repayments of Principal in Year Three		$ 10,000,000
2018		3.97%
Long-term Debt, Maturities, Repayments of Principal in Year Four	$ 10,000,000	$ 45,000,000
2019	3.44%	3.40%
Long-term Debt, Maturities, Repayments of Principal in Year Five	$ 25,000,000	$ 45,000,000
2020	2.48%	2.66%
Long-term Debt	$ 45,000,000	$ 110,000,000
Total Wholesale Structures Repurchase Agreements	2.83%	3.11%