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Note 8 - Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2014, net of tax of $3,770
   $ 6,160  
         
Other comprehensive income before reclassifications,
net of tax of $533
     871  
Amounts reclassified from accumulated other comprehensive
income, net of tax of $(385)
     (629 )
Net other comprehensive income (loss)
     242  
         
Balance at December 31, 2014, 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  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
 
  
Amounts Reclassified from Accumulated Other Comprehensive Income
  
 
Details about Accumulated Other  
(a)
    
Comprehensive Income Component   2015     2014   Statement of Operations Classification
    (in thousands)    
Unrealized gains and losses on available-for-sale securities:
                  
Realized gain on sale of securities
   $ 1,043     $ 1,015  
Non-operating income
Impairment expense
     (833 )     (1 )
Non-operating income
Total before tax
     210       1,014  
Income before income taxes
Tax expense
     (80 )     (385 )
Income tax expense
Total after tax
   $ 130     $ 629  
Net income