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Note 5 - Loans and Allowance for Loan Losses - Recorded Investments in Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Principal loan balance $ 383,703 $ 361,998
Accrued interest receivable 1,224 1,361
Deferred loan origination fees, net 837 583
Recorded investment in loans 385,764 363,942
Real Estate Mortgage Portfolio Segment [Member] | Real Estate Loan [Member]    
Principal loan balance 137,842 147,933
Accrued interest receivable 455 584
Deferred loan origination fees, net 80 58
Recorded investment in loans 138,377 148,575
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]    
Principal loan balance 13,895 12,962
Accrued interest receivable 42 70
Deferred loan origination fees, net 14 6
Recorded investment in loans 13,951 13,038
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]    
Principal loan balance 19,445 12,555
Accrued interest receivable 44 61
Deferred loan origination fees, net 0 0
Recorded investment in loans 19,489 12,616
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]    
Principal loan balance 96,462 84,493
Accrued interest receivable 249 281
Deferred loan origination fees, net (42) (46)
Recorded investment in loans 96,669 84,728
Commercial Portfolio Segment [Member]    
Principal loan balance 24,056 23,095
Accrued interest receivable 67 64
Deferred loan origination fees, net 3 (6)
Recorded investment in loans 24,126 23,153
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]    
Principal loan balance 42,908 38,476
Accrued interest receivable 141 130
Deferred loan origination fees, net 782 571
Recorded investment in loans 43,831 39,177
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member]    
Principal loan balance 49,095 42,484
Accrued interest receivable 226 171
Deferred loan origination fees, net 0 0
Recorded investment in loans $ 49,321 $ 42,655