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Note 10 - Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2017, net of tax of $4,576
   $
7,476
  
         
Other comprehensive income before reclassifications, net of tax of $(687)
    
2,001
  
Amounts reclassified from accumulated other comprehensive income, net of tax of $(1,310)
    
(2,033
 )
Net other comprehensive income (loss)
    
(32
 )
         
Balance at December 31, 2017, net of tax of $2,579
    
7,444
  
         
Cumulative effect adjustment – ASU 2016-01
    
(7,444
 )
         
Net other comprehensive income (loss)
    
(7,444
 )
         
Balance at December 31, 2018
   $
-
  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Details about Accumulated Other
  
Amounts Reclassified from Accumulated Other Comprehensive Income
   Statement of Operations
Comprehensive Income Component
  
2018
    
2017
   Classification
   
(in thousands)
    
Unrealized gains and losses on available-for-sale securities:
                  
Unrealized gains and losses on securities sold
   $
-
     $
3,385
  
Non-operating income
Impairment expense
    
-
      
(42
 )
Non-operating income
Total before tax
    
-
      
3,343
  
Income before income taxes
Tax expense
    
-
      
(1,310
 )
Income tax expense
Total after tax
   $
-
     $
2,033
  
Net income