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Note 8 - Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Unrealized gains and losses on available-for-sale securities
  
   
(in thousands)
  
         
Balance at January 1, 2015, net of tax of $3,918
   $
6,402
  
         
Other comprehensive income before reclassifications,
net of tax of $(588)
    
(962
 )
Amounts reclassified from accumulated other comprehensive
income, net of tax of $(80)
    
(130
 )
Net other comprehensive income (loss)
    
(1,092
 )
         
Balance at December 31, 2015, net of tax of $3,250
    
5,310
  
         
Other comprehensive income before reclassifications,
net of tax of $1,390
    
2,269
  
Amounts reclassified from accumulated other comprehensive
income, net of tax of $(64)
    
(103
 )
Net other comprehensive income (loss)
    
2,166
  
         
Balance at December 31, 2016, net of tax of $4,576
   $
7,476
  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Details about Accumulated Other
  
Amounts Reclassified from Accumulated Other Comprehensive Income
(a)
  
Statement of Operations
Comprehensive Income Component
  
2016
    
2015
  
Classification
   
(in thousands)
    
Unrealized gains and losses on available-for-sale securities:
                  
Unrealized gains and losses on securities sold
   $
876
     $
1,043
  
Non-operating income
Impairment expense
    
(709
 )    
(833
 )
Non-operating income
Total before tax
    
167
      
210
  
Income before income taxes
Tax expense
    
(64
 )    
(80
 )
Income tax expense
Total after tax
   $
103
     $
130
  
Net income