Note 8 - Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
   
2016
    
2015
    
2014
  
Current
   $
8,500
     
3,836
     
2,607
 
Deferred
    
257
     
874
     
28
 
Expense of operating loss carryforwards
    
637
     
766
     
536
 
Change in valuation allowance
    
-
     
-
     
(12
 )
Total income tax expense
   $
9,394
     
5,476
     
3,159
 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
   
2016
    
2015
    
2014
  
Pre-tax income at statutory rate
   $
10,084
     
5,831
     
3,085
 
State income tax expense, net
    
727
     
416
     
224
 
Cash surrender value income
    
(284
 )    
(147
 )    
(83
 )
Tax-exempt interest
    
(295
 )    
(168
 )    
(65
 )
Noncontrolling interest
    
(547
 )    
(703
 )    
(174
 )
Merger-related expenses
    
108
     
114
     
111
 
Change in valuation allowance
    
-
     
-
     
(12
 )
Other
    
(399
 )    
133
     
73
 
Total income tax expense
   $
9,394
     
5,476
     
3,159
 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
   
2016
    
2015
  
Deferred income tax assets:
                
Allowance for loan losses
   $
7,318
     
7,252
 
Accrued expenses
    
6
     
106
 
Operating loss carryforwards and credits
    
5,611
     
6,159
 
Premises and equipment
    
733
     
826
 
Non-accrual interest income
    
91
     
104
 
Stock-based compensation
    
1,118
     
1,037
 
Other real estate
    
-
     
38
 
Deferred compensation
    
430
     
95
 
Goodwill and intangible assets
    
206
     
235
 
Other
   
233
     
540
 
Total gross deferred income tax assets
    
15,746
     
16,392
 
                 
Deferred income tax liabilities:
                
Unrealized gains on investment securities available-for-sale
    
135
     
295
 
Prepaid expenses
    
475
     
423
 
Core deposit intangible
    
772
     
1,060
 
Derivatives
    
80
     
-
 
Investment in pass-through entity
    
797
     
424
 
Total gross deferred income tax liabilities
    
2,259
     
2,202
 
Net deferred income tax assets
   $
13,487
     
14,190