Note 9 - Fair Value Measurements and Disclosures (Details) - Financial and Off-Balance Sheet Instruments (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Financial assets
Cash and cash equivalents	$ 65,417,000	$ 16,286,000	$ 19,524,000	$ 15,453,000
Cash and cash equivalents	65,417,000	16,286,000
Investment securities:
Trading	4,122,000	0
Available-for-sale	362,468,000	388,670,000
Held-to-maturity	146,000	146,000
Held-to-maturity	158,000	162,000
Restricted investment in bank stocks	1,721,000	1,764,000
Loans held-for-sale	130,000
Loans held-for-sale	134,000
Net loans	528,316,000	492,791,000
Net loans	527,819,000	491,635,000
Mortgage servicing rights	511,000	519,000
Mortgage servicing rights	631,000	643,000
Accrued interest receivable	2,604,000	2,579,000
Accrued interest receivable	2,604,000	2,579,000
Financial liabilities
Deposits with no stated maturities	880,296,000	814,532,000
Short-term borrowings	28,648,000	35,156,000
Short-term borrowings	28,648,000	35,156,000
Long-term debt		5,000,000
Long-term debt		5,056,000
Accrued interest payable	337,000	392,000
Accrued interest payable	337,000	392,000
With No Stated Maturities [Member] | Fair Value, Inputs, Level 1 [Member]
Financial liabilities
Deposits with no stated maturities	633,945,000	574,987,000
With No Stated Maturities [Member]
Financial liabilities
Deposits with no stated maturities	633,945,000	574,987,000
Deposits with no stated maturities	633,945,000	574,987,000
With Stated Maturities [Member] | Fair Value, Inputs, Level 2 [Member]
Financial liabilities
Deposits with no stated maturities	247,201,000	241,959,000
With Stated Maturities [Member]
Financial liabilities
Deposits with no stated maturities	246,351,000	239,545,000
Deposits with no stated maturities	247,201,000	241,959,000
Fair Value, Inputs, Level 1 [Member]
Financial assets
Cash and cash equivalents	65,417,000	16,286,000
Investment securities:
Available-for-sale	7,293,000	6,625,000
Financial liabilities
Short-term borrowings	28,648,000	35,156,000
Fair Value, Inputs, Level 2 [Member]
Investment securities:
Trading	4,122,000
Available-for-sale	352,713,000	379,976,000
Held-to-maturity	158,000	162,000
Restricted investment in bank stocks	1,721,000	1,764,000
Loans held-for-sale	134,000
Accrued interest receivable	2,604,000	2,579,000
Financial liabilities
Long-term debt		5,056,000
Accrued interest payable	337,000	392,000
Fair Value, Inputs, Level 3 [Member]
Investment securities:
Available-for-sale	2,462,000	2,069,000
Net loans	527,819,000	491,635,000
Mortgage servicing rights	$ 631,000	$ 643,000