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Note 2 - Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
September 30, 2017
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
(Amounts in thousands)
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. Treasury securities
   $
36,973
     $
-
     $
(9
 )   $
36,964
  
U.S. Agency securities
    
1,254
      
21
      
-
      
1,275
  
Municipal securities
    
102,347
      
2,648
      
(88
 )    
104,907
  
Single issue trust preferred securities
    
9,363
      
-
      
(401
 )    
8,962
  
Mortgage-backed Agency securities
    
22,518
      
72
      
(347
 )    
22,243
  
Equity securities
    
55
      
18
      
-
      
73
  
Total securities available for sale
   $
172,510
     $
2,759
     $
(845
 )   $
174,424
  
   
December 31, 2016
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
(Amounts in thousands)
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. Agency securities
   $
1,342
     $
3
     $
-
     $
1,345
  
Municipal securities
    
111,659
      
2,258
      
(586
 )    
113,331
  
Single issue trust preferred securities
    
22,104
      
-
      
(2,165
 )    
19,939
  
Mortgage-backed Agency securities
    
31,290
      
66
      
(465
 )    
30,891
  
Equity securities
    
55
      
18
      
-
      
73
  
Total securities available for sale
   $
166,450
     $
2,345
     $
(3,216
 )   $
165,579
  
Held-to-maturity Securities [Table Text Block]
   
September 30, 2017
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
(Amounts in thousands)
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. Agency securities
   $
17,949
     $
31
     $
-
     $
17,980
  
Corporate securities
    
7,233
      
13
      
-
      
7,246
  
Total securities held to maturity
   $
25,182
     $
44
     $
-
     $
25,226
  
   
December 31, 2016
  
   
Amortized
    
Unrealized
    
Unrealized
    
Fair
  
   
Cost
    
Gains
    
Losses
    
Value
  
(Amounts in thousands)
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. Agency securities
   $
36,741
     $
124
     $
-
     $
36,865
  
Corporate securities
    
10,392
      
11
      
(2
 )    
10,401
  
Total securities held to maturity
   $
47,133
     $
135
     $
(2
 )   $
47,266
  
Investments Classified by Contractual Maturity Date [Table Text Block]
   
September 30, 2017
  
   
Amortized
   
 
 
 
(Amounts in thousands)
  
Cost
   
Fair Value
 
Available-for-sale securities
  
 
 
 
  
 
 
 
Due within one year
   $
37,288
     $
37,279
  
Due after one year but within five years
    
5,617
      
5,734
  
Due after five years but within ten years
    
96,693
      
98,602
  
Due after ten years
    
10,339
      
10,493
  
     
149,937
      
152,108
  
Mortgage-backed securities
    
22,518
      
22,243
  
Equity securities
    
55
      
73
  
Total securities available for sale
   $
172,510
     $
174,424
  
                 
Held-to-maturity securities
  
 
 
 
  
 
 
 
Due within one year
   $
-
     $
-
  
Due after one year but within five years
    
25,182
      
25,226
  
Due after five years but within ten years
    
-
      
-
  
Due after ten years
    
-
      
-
  
Total securities held to maturity
   $
25,182
     $
25,226
  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]
   
September 30, 2017
  
   
Less than 12 Months
    
12 Months or Longer
    
Total
  
   
Fair
    
Unrealized
    
Fair
    
Unrealized
    
Fair
    
Unrealized
  
   
Value
    
Losses
    
Value
    
Losses
    
Value
    
Losses
  
(Amounts in thousands)
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. Treasury securities
   $
36,963
     $
(9
 )   $
-
     $
-
     $
36,963
     $
(9
 )
Municipal securities
    
9,421
      
(52
 )    
1,427
      
(36
 )    
10,848
      
(88
 )
Single issue trust preferred securities
    
-
      
-
      
8,962
      
(401
 )    
8,962
      
(401
 )
Mortgage-backed Agency securities
    
7,898
      
(59
 )    
8,281
      
(288
 )    
16,179
      
(347
 )
Total
   $
54,282
     $
(120
 )   $
18,670
     $
(725
 )   $
72,952
     $
(845
 )
   
December 31, 2016
  
   
Less than 12 Months
    
12 Months or Longer
    
Total
  
   
Fair
    
Unrealized
    
Fair
    
Unrealized
    
Fair
    
Unrealized
  
   
Value
    
Losses
    
Value
    
Losses
    
Value
    
Losses
  
(Amounts in thousands)
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Municipal securities
   $
24,252
     $
(527
 )   $
715
     $
(59
 )   $
24,967
     $
(586
 )
Single issue trust preferred securities
    
-
      
-
      
19,939
      
(2,165
 )    
19,939
      
(2,165
 )
Mortgage-backed Agency securities
    
12,834
      
(166
 )    
11,851
      
(299
 )    
24,685
      
(465
 )
Total
   $
37,086
     $
(693
 )   $
32,505
     $
(2,523
 )   $
69,591
     $
(3,216
 )
Schedule of Held to Maturity Debt Securities [Table Text Block]
   
December 31, 2016
  
   
Less than 12 Months
    
12 Months or Longer
    
Total
  
   
Fair
    
Unrealized
    
Fair
    
Unrealized
    
Fair
    
Unrealized
  
   
Value
    
Losses
    
Value
    
Losses
    
Value
    
Losses
  
(Amounts in thousands)
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Corporate securities
   $
3,533
     $
(2
 )   $
-
     $
-
     $
3,533
     $
(2
 )
Total
   $
3,533
     $
(2
 )   $
-
     $
-
     $
3,533
     $
(2
 )
Realized Gain (Loss) on Investments [Table Text Block]
   
Three Months Ended
    
Nine Months Ended
  
   
September 30,
    
September 30,
  
   
2017
    
2016
    
2017
    
2016
  
(Amounts in thousands)
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Gross realized gains
   $
-
     $
203
     $
-
     $
344
  
Gross realized losses
    
-
      
(178
 )    
(657
 )    
(397
 )
Net gain (loss) on sale of securities
   $
-
     $
25
     $
(657
 )   $
(53
 )