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Note 9 - Financial and Off-balance Sheet Instruments (Details) - USD ($)
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Inputs, Level 1 [Member] | With No Stated Maturities [Member]        
Deposits with no stated maturities $ 664,912,000 $ 662,410,000    
Fair Value, Inputs, Level 1 [Member] | With Stated Maturities [Member]        
Deposits with no stated maturities    
Fair Value, Inputs, Level 1 [Member]        
Cash and cash equivalents 57,949,000 16,991,000    
Trading    
Available-for-sale 7,773,000 7,234,000    
Total investment securities held-to-maturity    
Restricted investment in bank stocks    
Loans held-for-sale    
Net loans    
Mortgage servicing rights    
Accrued interest receivable    
Short-term borrowings 36,693,000 37,163,000    
Accrued interest payable    
Fair Value, Inputs, Level 2 [Member] | With No Stated Maturities [Member]        
Deposits with no stated maturities    
Fair Value, Inputs, Level 2 [Member] | With Stated Maturities [Member]        
Deposits with no stated maturities 231,803,000 227,862,000    
Fair Value, Inputs, Level 2 [Member]        
Cash and cash equivalents    
Trading 3,459,000 4,189,000    
Available-for-sale 334,080,000 352,028,000    
Total investment securities held-to-maturity 149,000 151,000    
Restricted investment in bank stocks 522,000 508,000    
Loans held-for-sale 191,000 1,004,000    
Net loans    
Mortgage servicing rights    
Accrued interest receivable 2,376,000 2,562,000    
Short-term borrowings    
Accrued interest payable 330,000 330,000    
Fair Value, Inputs, Level 3 [Member] | With No Stated Maturities [Member]        
Deposits with no stated maturities    
Fair Value, Inputs, Level 3 [Member] | With Stated Maturities [Member]        
Deposits with no stated maturities    
Fair Value, Inputs, Level 3 [Member]        
Cash and cash equivalents    
Trading    
Available-for-sale 2,400,000 2,653,000    
Total investment securities held-to-maturity    
Restricted investment in bank stocks    
Loans held-for-sale    
Net loans 607,603,000 610,315,000    
Mortgage servicing rights 578,000 642,000    
Accrued interest receivable    
Short-term borrowings    
Accrued interest payable    
With No Stated Maturities [Member]        
Deposits with no stated maturities 664,912,000 662,410,000    
Deposits with no stated maturities 664,912,000 662,410,000    
With Stated Maturities [Member]        
Deposits with no stated maturities 228,373,000 227,376,000    
Deposits with no stated maturities 231,803,000 227,862,000    
Cash and cash equivalents 57,949,000 16,991,000 $ 20,624,000 $ 18,245,000
Cash and cash equivalents 57,949,000 16,991,000    
Trading 3,459,000 4,189,000    
Available-for-sale 344,253,000 361,915,000    
Total investment securities held-to-maturity 147,000 147,000    
Total investment securities held-to-maturity 149,000 151,000    
Restricted investment in bank stocks 522,000 508,000    
Restricted investment in bank stocks 522,000 508,000    
Loans held-for-sale 184,000 987,000    
Loans held-for-sale 191,000 1,004,000    
Net loans 596,928,000 607,716,000    
Net loans 607,603,000 610,315,000    
Mortgage servicing rights 495,000 504,000    
Mortgage servicing rights 578,000 642,000    
Accrued interest receivable 2,376,000 2,562,000    
Accrued interest receivable 2,376,000 2,562,000    
Deposits with no stated maturities 893,285,000 889,786,000    
Short-term borrowings 36,693,000 37,163,000    
Short-term borrowings 36,693,000 37,163,000    
Accrued interest payable 330,000 330,000    
Accrued interest payable $ 330,000 $ 330,000