Note 21 - Disclosure of Financial Instruments Not Reported at Fair Value - Financial Assets and Financial Liabilities That Are Not Measured and Reported at Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financial assets
Cash and short-term investments	$ 47,973	$ 103,833
Accrued interest receivable	6,878	6,610
Financial liabilities
Accrued interest payable	144	127
Reported Value Measurement [Member]
Financial assets
Cash and short-term investments	47,973	103,833
Mortgage loans held for sale	3,213	6,800
Federal Home Loan Bank stock and other securities	6,347	6,347
Loans, net	2,281,368	2,010,566
Accrued interest receivable	6,878	6,610
Financial liabilities
Deposits	2,520,548	2,371,702
Short-term borrowings	114,969	87,003
FHLB Advances	51,075	43,468
Accrued interest payable	144	127
Estimate of Fair Value Measurement [Member]
Financial assets
Cash and short-term investments	47,973	103,833
Mortgage loans held for sale	3,481	7,112
Federal Home Loan Bank stock and other securities	6,347	6,347
Loans, net	2,284,569	2,021,776
Accrued interest receivable	6,878	6,610
Financial liabilities
Deposits	2,519,725	2,371,300
Short-term borrowings	114,969	87,003
FHLB Advances	50,806	43,647
Accrued interest payable	144	127
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets
Cash and short-term investments	47,973	103,833
Mortgage loans held for sale
Federal Home Loan Bank stock and other securities
Loans, net
Accrued interest receivable	6,878	6,610
Financial liabilities
Deposits
Short-term borrowings
FHLB Advances
Accrued interest payable	144	127
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Financial assets
Cash and short-term investments
Mortgage loans held for sale	3,481	7,112
Federal Home Loan Bank stock and other securities	6,347	6,347
Loans, net
Accrued interest receivable
Financial liabilities
Deposits
Short-term borrowings	114,969	87,003
FHLB Advances	50,806	43,647
Accrued interest payable
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Financial assets
Cash and short-term investments
Mortgage loans held for sale
Federal Home Loan Bank stock and other securities
Loans, net	2,284,569	2,021,776
Accrued interest receivable
Financial liabilities
Deposits	2,519,725	2,371,300
Short-term borrowings
FHLB Advances
Accrued interest payable