Note 3 - Loans (Detail) - Impaired Loans (USD $)
In Thousands, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Loans Secured by Mortgages on Real Estate    
Impaired loans with no related allowance: Recorded Investment $ 694 $ 842
Impaired loans with no related allowance: Unpaid Principal Balance 694 842
Impaired loans with no related allowance: Average Recorded Investment YTD 840 529
Impaired loans with no related allowance: Interest Income Recognized 18 30
Loans Secured by Mortgages on Real Estate    
Impaired loans with a related allowance: Recorded Investment 21 232
Impaired loans with a related allowance: Unpaid Principal Balance 21 232
Impaired loans with a related allowance: Related Allowance 2 128
Impaired loans with a related allowance: Average Recorded Investment YTD 163 300
Impaired loans with a related allowance: Interest Income Recognized 1 22
Loans Secured by Mortgages on Real Estate    
Impaired loans: Recorded Investment 715 1,074
Impaired loans: Unpaid Principal Balance 715 1,074
Impaired loans: Related Allowance 2 128
Impaired loans: Average Recorded Investment YTD 1,003 829
Impaired loans: Interest Income Recognized 19 52
1-4 Family Residential [Member]
   
Loans Secured by Mortgages on Real Estate    
Impaired loans with no related allowance: Recorded Investment 491 110
Impaired loans with no related allowance: Unpaid Principal Balance 491 110
Impaired loans with no related allowance: Average Recorded Investment YTD 409 95
Impaired loans with no related allowance: Interest Income Recognized 1 4
Loans Secured by Mortgages on Real Estate    
Impaired loans with a related allowance: Related Allowance   2
Impaired loans with a related allowance: Average Recorded Investment YTD 27  
Loans Secured by Mortgages on Real Estate    
Impaired loans: Recorded Investment 491 110
Impaired loans: Unpaid Principal Balance 491 110
Impaired loans: Related Allowance   2
Impaired loans: Average Recorded Investment YTD 436 95
Impaired loans: Interest Income Recognized 1 4
Home Equity Loans and Lines [Member]
   
Loans Secured by Mortgages on Real Estate    
Impaired loans with no related allowance: Recorded Investment 128 402
Impaired loans with no related allowance: Unpaid Principal Balance 128 402
Impaired loans with no related allowance: Average Recorded Investment YTD 282 346
Impaired loans with no related allowance: Interest Income Recognized 11 10
Loans Secured by Mortgages on Real Estate    
Impaired loans with a related allowance: Recorded Investment 21 167
Impaired loans with a related allowance: Unpaid Principal Balance 21 167
Impaired loans with a related allowance: Related Allowance 2 61
Impaired loans with a related allowance: Average Recorded Investment YTD 120 233
Impaired loans with a related allowance: Interest Income Recognized 1 17
Loans Secured by Mortgages on Real Estate    
Impaired loans: Recorded Investment 149 569
Impaired loans: Unpaid Principal Balance 149 569
Impaired loans: Related Allowance 2 61
Impaired loans: Average Recorded Investment YTD 402 579
Impaired loans: Interest Income Recognized 12 27
Multi-family Residential [Member]
   
Loans Secured by Mortgages on Real Estate    
Impaired loans with no related allowance: Recorded Investment 27  
Impaired loans with no related allowance: Unpaid Principal Balance 27  
Impaired loans with no related allowance: Average Recorded Investment YTD 20  
Loans Secured by Mortgages on Real Estate    
Impaired loans: Recorded Investment 27  
Impaired loans: Unpaid Principal Balance 27  
Impaired loans: Average Recorded Investment YTD 20  
Commercial Real Estate Loans [Member]
   
Loans Secured by Mortgages on Real Estate    
Impaired loans with no related allowance: Recorded Investment 48 330
Impaired loans with no related allowance: Unpaid Principal Balance 48 330
Impaired loans with no related allowance: Average Recorded Investment YTD 119 66
Impaired loans with no related allowance: Interest Income Recognized   16
Loans Secured by Mortgages on Real Estate    
Impaired loans: Recorded Investment 48 330
Impaired loans: Unpaid Principal Balance 48 330
Impaired loans: Average Recorded Investment YTD 119 66
Impaired loans: Interest Income Recognized   16
Land Loans [Member]
   
Loans Secured by Mortgages on Real Estate    
Impaired loans with no related allowance: Average Recorded Investment YTD   14
Loans Secured by Mortgages on Real Estate    
Impaired loans: Average Recorded Investment YTD   14
Consumer and Other Loans [Member]
   
Loans Secured by Mortgages on Real Estate    
Impaired loans with no related allowance: Average Recorded Investment YTD 10 8
Impaired loans with no related allowance: Interest Income Recognized 6  
Loans Secured by Mortgages on Real Estate    
Impaired loans with a related allowance: Recorded Investment   65
Impaired loans with a related allowance: Unpaid Principal Balance   65
Impaired loans with a related allowance: Related Allowance   65
Impaired loans with a related allowance: Average Recorded Investment YTD 16 67
Impaired loans with a related allowance: Interest Income Recognized   5
Loans Secured by Mortgages on Real Estate    
Impaired loans: Recorded Investment   65
Impaired loans: Unpaid Principal Balance   65
Impaired loans: Related Allowance   65
Impaired loans: Average Recorded Investment YTD 26 75
Impaired loans: Interest Income Recognized $ 6 $ 5