Note 15 - Fair Value Measurements and Disclosures (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
December 31, 2016
  
Level 1
    
Level 2
    
Level 3
   
Total
  
U.S. Government agency obligations
   $
-
     
3,617
     
-
     
3,617
 
Mortgage-backed securities
    
-
     
39,148
     
-
     
39,148
 
Municipal securities
    
-
     
4,523
     
-
     
4,523
 
Other asset-backed securities
    
-
     
26,092
     
-
     
26,092
 
Total investment securities available-for-sale
   $
-
     
73,380
     
-
     
73,380
 
Mortgage loans held-for-sale
   $
-
     
15,373
     
-
     
15,373
 
Derivative assets
   $
-
     
427
     
-
     
427
 
Derivative liabilities
   $
-
     
366
     
-
     
366
 
December 31, 2015
  
Level 1
    
Level 2
    
Level 3
   
Total
  
Mortgage-backed securities
   $
-
     
48,726
     
-
     
48,726
 
Municipal securities
    
-
     
4,679
     
-
     
4,679
 
Total investment securities available-for-sale
    
-
     
53,405
     
-
     
53,405
 
Derivative assets
   $
-
     
258
     
-
     
258
 
Derivative liabilities
   $
-
     
518
     
-
     
518
 
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]
December 31, 2016
  
Level 1
    
Level 2
    
Level 3
   
Total
  
Other real estate
   $
-
     
-
     
2,068
     
2,068
 
Impaired loans
    
-
     
-
     
2,837
     
2,837
 
December 31, 2015
  
Level 1
    
Level 2
    
Level 3
   
Total
  
Other real estate
 
 $
-
     
-
     
3,965
     
3,965
 
Impaired loans
    
-
     
-
     
3,695
     
3,695
 
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]
December 31, 2016
  
Fair Value
   
Valuation Technique
 
Unobservable Inputs
 
Range of
Discounts
   
Weighted
Average
Discounts
 
Other real estate
   $
2,068
   
Third party appraisals, sales contracts, Broker Price opinions
 
Collateral discounts and estimated costs to sell
   
11%
-
35% 
      
11% 
  
Impaired loans
    
2,837
   
Third party appraisals and discounted cash flows
 
Collateral discounts and discount rates
   
 0%
-
100%
      
33%
  
                                     
                                     
December 31, 2015
                                    
Other real estate
   $
3,965
   
Third party appraisals, sales contracts, Broker price opinions
 
Collateral discounts and estimated costs to sell
   
11%
-
35% 
      
16%
  
Impaired loans
    
3,695
   
Third party appraisals and discounted cash flows
 
Collateral discounts and discount rates
   
16%
-
100%
      
34%
  
Fair Value, by Balance Sheet Grouping [Table Text Block]
   
Carrying
    
Estimated Fair Value
  
December 31, 2016
  
Amount
   
Level 1
   
Level 2
    
Level 3
  
Assets:
                                
Cash and cash equivalents
   $
217,293
     
217,293
     
-
     
-
 
Investment securities held-to-maturity
    
26,329
     
-
     
25,894
     
-
 
Investment securities available-for-sale
    
73,380
     
-
     
73,380
     
-
 
Other investments
    
7,879
     
-
     
7,879
     
-
 
Loans, net
    
1,473,371
     
-
     
1,470,491
     
2,837
 
Mortgage loans held-for-sale
    
15,373
     
-
     
15,373
     
-
 
Bank-owned life insurance
    
28,034
     
-
     
28,034
     
-
 
Derivative assets
   
427
     
-
     
427
     
-
 
                                 
Liabilities:
                                
Deposits
    
1,667,710
     
-
     
1,616,266
     
-
 
Federal Home Loan Bank advances
    
7,000
     
-
     
7,247
     
-
 
Subordinated debt
    
24,500
     
-
     
22,794
     
-
 
Derivative liabilities
    
366
     
-
     
366
     
-
 
   
Carrying
    
Estimated Fair Value
  
December 31, 2015
  
Amount
   
Level 1
   
Level 2
    
Level 3
  
Assets:
                                
Cash and cash equivalents
   $
212,457
     
212,457
     
-
     
-
 
Investment securities held-to-maturity
    
27,458
     
-
     
27,843
     
-
 
Investment securities available-for-sale
    
53,405
     
-
     
53,405
     
-
 
Other investments
    
6,235
     
-
     
6,235
     
-
 
Loans, net
    
1,309,572
     
-
     
1,309,547
     
3,695
 
Mortgage loans held-for-sale
    
15,020
     
-
     
15,020
     
-
 
Bank-owned life insurance
    
27,223
     
-
     
27,223
     
-
 
Derivative assets
   
258
     
-
     
258
     
-
 
                                 
Liabilities:
                                
Deposits
    
1,514,458
     
-
     
1,479,746
     
-
 
Federal Home Loan Bank advances
    
22,000
     
-
     
22,405
     
-
 
Derivative liabilities
    
518
     
-
     
518
     
-