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Note 7 - Loans and Related Allowance for Loan and Lease Losses (Details) - Allowance for Loan Losses - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Dec. 31, 2014
Ending allowance balance attributable to loans:            
Individually evaluated for impairment         $ 625,000 $ 1,596,000
Collectively evaluated for impairment         5,695,000 5,250,000
Total ending allowance balance $ 6,320,000 $ 7,288,000 $ 6,320,000 $ 7,046,000 6,320,000 6,846,000
Ending allowance balance attributable to loans:            
ALLL balance, period start 6,346,000 7,129,000 6,846,000 7,046,000    
ALLL balance, period end 6,320,000 7,288,000 6,320,000 7,288,000    
Charge-offs (229,000) (32,000) (1,109,000) (616,000)    
Recoveries 98,000 121,000 373,000 488,000    
Provision 105,000 70,000 210,000 370,000    
Commercial and Industrial [Member]            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment         119,000 83,000
Collectively evaluated for impairment         459,000 559,000
Total ending allowance balance 578,000 686,000 578,000 614,000 578,000 642,000
Ending allowance balance attributable to loans:            
ALLL balance, period start 610,000 596,000 642,000 614,000    
ALLL balance, period end 578,000 686,000 578,000 686,000    
Charge-offs (100,000) (3,000) (196,000) (95,000)    
Recoveries 5,000 23,000 186,000 88,000    
Provision 63,000 70,000 (54,000) 79,000    
Real Estate Construction Porfolio Segment [Member]            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment         153,000 589,000
Collectively evaluated for impairment         181,000 279,000
Total ending allowance balance 334,000 843,000 334,000 576,000 334,000 868,000
Ending allowance balance attributable to loans:            
ALLL balance, period start 363,000 423,000 868,000 576,000    
ALLL balance, period end 334,000 843,000 334,000 843,000    
Charge-offs 0 0 (385,000) 0    
Recoveries 0   0 60,000    
Provision (29,000) 420,000 (149,000) 207,000    
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment         267,000 892,000
Collectively evaluated for impairment         3,159,000 2,811,000
Total ending allowance balance 3,426,000 3,950,000 3,426,000 3,664,000 3,426,000 3,703,000
Ending allowance balance attributable to loans:            
ALLL balance, period start 3,347,000 4,130,000 3,703,000 3,664,000    
ALLL balance, period end 3,426,000 3,950,000 3,426,000 3,950,000    
Charge-offs (124,000) (24,000) (425,000) (481,000)    
Recoveries 81,000 94,000 161,000 289,000    
Provision 122,000 (250,000) (13,000) 478,000    
Commercial Portfolio Segment [Member] | Commercial Loans [Member]            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment         86,000 30,000
Collectively evaluated for impairment         1,853,000 1,546,000
Total ending allowance balance 1,939,000 1,754,000 1,939,000 2,170,000 1,939,000 1,576,000
Ending allowance balance attributable to loans:            
ALLL balance, period start 1,978,000 1,925,000 1,576,000 2,170,000    
ALLL balance, period end 1,939,000 1,754,000 1,939,000 1,754,000    
Charge-offs (5,000) 0 (92,000) 0    
Recoveries 5,000   5,000 40,000    
Provision (39,000) (171,000) 450,000 (456,000)    
Consumer Portfolio Segment [Member]            
Ending allowance balance attributable to loans:            
Individually evaluated for impairment         0 2,000
Collectively evaluated for impairment         43,000 55,000
Total ending allowance balance 43,000 55,000 43,000 22,000 $ 43,000 $ 57,000
Ending allowance balance attributable to loans:            
ALLL balance, period start 48,000 55,000 57,000 22,000    
ALLL balance, period end 43,000 55,000 43,000 55,000    
Charge-offs   (5,000) (11,000) (40,000)    
Recoveries 7,000 4,000 21,000 11,000    
Provision $ (12,000) $ 1,000 $ (24,000) $ 62,000