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Note 7 - Loans And Related Allowance For Loan Losses (Details) - Allowance for Loan Losses (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2012
Dec. 31, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2011
Ending allowance balance attributable to loans:              
Individually evaluated for impairment $ 2,540,000     $ 3,688,000      
Collectively evaluated for impairment 5,281,000     4,091,000      
Allowance balance 7,821,000     7,779,000      
Commercial and Industrial [Member]
              
Ending allowance balance attributable to loans:              
Individually evaluated for impairment 195,000     1,189,000      
Collectively evaluated for impairment 593,000     543,000      
Allowance balance 788,000     1,700,000      
Commercial and Industrial [Member] | End of Period [Member]
              
Ending allowance balance attributable to loans:              
Allowance balance 788,000 1,704,000 1,704,000 1,732,000      
Commercial and Industrial [Member] | Beginning of Period [Member]
              
Ending allowance balance attributable to loans:              
Allowance balance       1,732,000 875,000 1,626,000 1,296,000
Charge-offs 0 (60,000) (88,000) (325,000)      
Recoveries   1,000 70,000 92,000      
Provision (87,000) 137,000 426,000 (711,000)      
Real Estate Construction [Member]
              
Ending allowance balance attributable to loans:              
Individually evaluated for impairment 859,000     933,000      
Collectively evaluated for impairment 440,000     190,000      
Real Estate Construction [Member] | End of Period [Member]
              
Ending allowance balance attributable to loans:              
Allowance balance 1,299,000 445,000 445,000 1,123,000      
Real Estate Construction [Member] | Beginning of Period [Member]
              
Ending allowance balance attributable to loans:              
Allowance balance       1,123,000 1,191,000 504,000 438,000
Charge-offs   0 0 (190,000)      
Recoveries 0 0 0 33,000      
Provision 108,000 (59,000) 7,000 333,000      
Residential Real Estate Mortgage [Member]
              
Ending allowance balance attributable to loans:              
Individually evaluated for impairment 896,000     600,000      
Collectively evaluated for impairment 2,743,000     2,272,000      
Allowance balance 3,600,000     2,900,000      
Residential Real Estate Mortgage [Member] | End of Period [Member]
              
Ending allowance balance attributable to loans:              
Allowance balance 3,639,000 2,953,000 2,953,000 2,872,000      
Residential Real Estate Mortgage [Member] | Beginning of Period [Member]
              
Ending allowance balance attributable to loans:              
Allowance balance       2,872,000 3,626,000 4,109,000 3,731,000
Charge-offs (87,000) (570,000) (668,000) (432,000)      
Recoveries 2,000 12,000 15,000 73,000      
Provision 98,000 (598,000) (125,000) 1,126,000      
Commercial Real Estate Mortgage [Member]
              
Ending allowance balance attributable to loans:              
Individually evaluated for impairment 590,000     960,000      
Collectively evaluated for impairment 1,483,000     1,031,000      
Commercial Real Estate Mortgage [Member] | End of Period [Member]
              
Ending allowance balance attributable to loans:              
Allowance balance 2,073,000 2,055,000 2,055,000 1,991,000      
Commercial Real Estate Mortgage [Member] | Beginning of Period [Member]
              
Ending allowance balance attributable to loans:              
Allowance balance       1,991,000 2,005,000 1,492,000 1,306,000
Charge-offs 0 (70,000) (123,000) 0      
Recoveries 0 0 0 46,000      
Provision 68,000 633,000 872,000 36,000      
Consumer Installment [Member]
              
Ending allowance balance attributable to loans:              
Individually evaluated for impairment 0     6,000      
Collectively evaluated for impairment 22,000     55,000      
Consumer Installment [Member] | End of Period [Member]
              
Ending allowance balance attributable to loans:              
Allowance balance 22,000 16,000 16,000 61,000      
Consumer Installment [Member] | Beginning of Period [Member]
              
Ending allowance balance attributable to loans:              
Allowance balance       61,000 52,000 21,000 48,000
Charge-offs (5,000) (40,000) (62,000) (41,000)      
Recoveries 9,000 5,000 17,000 20,000      
Provision (34,000) 30,000 13,000 (18,000)      
End of Period [Member]
              
Ending allowance balance attributable to loans:              
Allowance balance 7,821,000 7,173,000 7,173,000 7,779,000      
Beginning of Period [Member]
              
Ending allowance balance attributable to loans:              
Allowance balance       7,779,000 7,749,000 7,752,000 6,819,000
Charge-offs (92,000) (740,000) (941,000) (988,000)      
Recoveries 11,000 18,000 102,000 264,000      
Provision $ 153,000 $ 143,000 $ 1,193,000 $ 766,000