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Note 1 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Property, Plant and Equipment [Table Text Block]
             
Accumulated
 
 
 
 
 
 
  
 
 
 
 
  
Depreciation and
   
Carrying
 
 
    
Cost
   
Amortization
   
Value
 
 
    
(Dollars in thousands)
  
December 31, 2016:                          
Airplane
  
 
$
29,497
 
 
$
8,250
 
 
$
21,247
 
Computer software and equipment
  
 
 
23,909
 
 
 
20,329
 
 
 
3,580
 
Leasehold improvements
  
 
 
11,530
 
 
 
9,370
 
 
 
2,160
 
Other
  
 
 
2,410
 
 
 
1,356
 
 
 
1,054
 
Total
  
 
$
67,346
 
 
$
39,305
 
 
$
28,041
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2015:
  
 
 
 
 
 
 
 
 
 
 
 
 
Airplane
  
 
$
28,997
 
 
$
7,701
 
 
$
21,296
 
Computer software and equipment
  
 
 
21,393
 
 
 
16,599
 
 
 
4,794
 
Leasehold improvements
  
 
 
10,207
 
 
 
8,317
 
 
 
1,890
 
Other
  
 
 
2,199
 
 
 
1,953
 
 
 
246
 
Total
  
 
$
62,796
 
 
$
34,570
 
 
$
28,226