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Note 11 - Reclassifications From Accumulated and Other Comprehensive Income: (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
2016
   
2015
 
Balance at March 31
  $ 2,495     $ 3,658  
Other comprehensive income/(loss) before reclassifications
    1,275       (1,004 )
Amounts reclassified from accumulated other comprehensive income
    (398 )     (278 )
Net current-period other comprehensive
 income/(loss)
    877       (1,282 )
Balance at June 30
  $ 3,372     $ 2,376  
   
2016
   
2015
 
Balance at December 31
  $ 2,055     $ 4,259  
Other comprehensive income/(loss) before reclassifications
    1,054       (977 )
Amounts reclassified from accumulated other comprehensive income
    263       (906 )
Net current-period other comprehensive
 income/(loss)
    1,317       (1,883 )
Balance at June 30
  $ 3,372     $ 2,376  
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
   
Reclassifications from Accumulated Other
Comprehensive Income for the three and six months ended
June 30, 2016 and 2015
 
 
   
Three months ended
June 30, 2016
   
Six months ended
June 30, 2016
   
Affected Line Item in Statement of Operations
Unrealized gain/(loss) on available-for-sale securities
  $ 613     $ (405 )  
Gains/(losses) on marketable securities
Total before tax
    613       (405 )    
Tax benefit
    (215 )     142      
Total reclassifications
  $ 398     $ (263 )    
                     
   
Three months ended
June 30, 2015
   
Six months ended
June 30, 2015
   
Affected Line Item in Statement of Operations
Unrealized gain on available-for-sale securities
  $ 451     $ 1,471    
Gains on marketable securities
Total before tax
    451       1,471      
Tax provision
    (173 )     (565 )    
Total reclassifications
  $ 278     $ 906