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Note 3 - Allowance for Loan Losses to Loan Portfolio Segment (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Dec. 31, 2015
Commercial Portfolio Segment [Member]            
Beginning Balance $ 3,400,000 $ 982,000 $ 1,027,000 $ 1,918,000    
Charge-offs (50,000) 0 (50,000) 0    
Recoveries 7,000 12,000 37,000    
Provision 352,000 (219,000) 2,713,000 (1,185,000)    
Ending Balance 3,702,000 770,000 3,702,000 770,000    
Ending balance: individually evaluated for impairment         $ 3,158,000  
Ending balance: collectively evaluated for impairment         544,000 $ 1,027,000
Total allowance for loan losses 3,400,000 982,000 3,702,000 770,000 3,702,000 1,027,000
Loans and Leases Receivable, Gross         69,723,000 59,752,000
Ending balance: individually evaluated for impairment         3,158,000 0
Ending balance: individually evaluated for impairment         66,564,000 59,752,000
Commercial Real Estate Portfolio Segment [Member]            
Beginning Balance 2,295,000 2,145,000 1,970,000 1,419,000    
Charge-offs 0 0 0 0    
Recoveries 0 35,000 0 35,000    
Provision (491,000) 204,000 (166,000) 930,000    
Ending Balance 1,804,000 2,384,000 1,804,000 2,384,000    
Ending balance: individually evaluated for impairment         0  
Ending balance: collectively evaluated for impairment         1,804,000 1,970,000
Total allowance for loan losses 2,295,000 2,145,000 1,804,000 2,384,000 1,804,000 1,970,000
Loans and Leases Receivable, Gross         258,920,000 245,828,000
Ending balance: individually evaluated for impairment         6,713,000 7,745,000
Ending balance: individually evaluated for impairment         252,207,000 238,083,000
Construction Portfolio Segment [Member]            
Beginning Balance 169,000 275,000 486,000 63,000    
Charge-offs 0 0 0 0    
Recoveries 0 0 0 0    
Provision (108,000) 119,000 (425,000) 331,000    
Ending Balance 61,000 394,000 61,000 394,000    
Ending balance: individually evaluated for impairment         0  
Ending balance: collectively evaluated for impairment         61,000 486,000
Total allowance for loan losses 169,000 275,000 61,000 394,000 61,000 486,000
Loans and Leases Receivable, Gross         48,048,000 15,551,000
Ending balance: individually evaluated for impairment         0 0
Ending balance: individually evaluated for impairment         48,048,000 15,551,000
Construction to Permanent Portfolio Segment [Member]            
Beginning Balance 145,000 150,000 123,000 215,000    
Charge-offs 0 0 0 0    
Recoveries 0 0 0 5,000    
Provision (18,000) 38,000 4,000 (32,000)    
Ending Balance 127,000 188,000 127,000 188,000    
Ending balance: individually evaluated for impairment         0  
Ending balance: collectively evaluated for impairment         127,000 123,000
Total allowance for loan losses 145,000 150,000 127,000 188,000 127,000 123,000
Loans and Leases Receivable, Gross         5,587,000 4,880,000
Ending balance: individually evaluated for impairment         0 0
Ending balance: individually evaluated for impairment         5,587,000 4,880,000
Residential Portfolio Segment [Member]            
Beginning Balance 647,000 832,000 740,000 831,000    
Charge-offs (186,000) (7,000) (190,000) (10,000)    
Recoveries 2,000   3,000 0    
Provision 949,000 (198,000) 859,000 (194,000)    
Ending Balance 1,412,000 627,000 1,412,000 627,000    
Ending balance: individually evaluated for impairment         0  
Ending balance: collectively evaluated for impairment         1,412,000 740,000
Total allowance for loan losses 647,000 832,000 1,412,000 627,000 1,412,000 740,000
Loans and Leases Receivable, Gross         103,969,000 110,837,000
Ending balance: individually evaluated for impairment         4,676,000 4,556,000
Ending balance: individually evaluated for impairment         99,294,000 106,281,000
Consumer Portfolio Segment [Member]            
Beginning Balance 531,000 726,000 677,000 478,000    
Charge-offs (2,000) (4,000) (4,000) (11,000)    
Recoveries 0 1,000 1,000 10,000    
Provision (329,000) (25,000) (474,000) 221,000    
Ending Balance 200,000 698,000 200,000 698,000    
Ending balance: individually evaluated for impairment         3,000 3,000
Ending balance: collectively evaluated for impairment         197,000 674,000
Total allowance for loan losses 531,000 726,000 200,000 698,000 200,000 677,000
Loans and Leases Receivable, Gross         73,903,000 47,521,000
Ending balance: individually evaluated for impairment         3,000 550,000
Ending balance: individually evaluated for impairment         73,900,000 46,971,000
Unallocated Financing Receivables [Member]            
Beginning Balance 22,000 98,000 219,000 0    
Charge-offs 0 0 0 0    
Recoveries 0 0 0 0    
Provision 81,000 (197,000) 179,000    
Ending Balance 22,000 179,000 22,000 179,000    
Ending balance: individually evaluated for impairment         0  
Ending balance: collectively evaluated for impairment         22,000 219,000
Total allowance for loan losses 22,000 98,000 22,000 179,000 22,000 219,000
Loans and Leases Receivable, Gross         0 0
Ending balance: individually evaluated for impairment         0 0
Ending balance: individually evaluated for impairment         0
Beginning Balance 7,209,000 5,208,000 5,242,000 4,924,000    
Charge-offs (238,000) (11,000) (244,000) (21,000)    
Recoveries 2,000 43,000 16,000 87,000    
Provision 355,000 0 2,314,000 250,000    
Ending Balance 7,328,000 5,240,000 7,328,000 5,240,000    
Ending balance: individually evaluated for impairment         3,161,000 3,000
Ending balance: collectively evaluated for impairment         4,167,000 5,239,000
Total allowance for loan losses $ 7,328,000 $ 5,208,000 $ 7,328,000 $ 5,240,000 7,328,000 5,242,000
Loans and Leases Receivable, Gross         560,150,000 484,369,000
Ending balance: individually evaluated for impairment         14,550,000 12,851,000
Ending balance: individually evaluated for impairment         $ 545,600,000 $ 471,518,000