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Note 7 - Results of Operations by Quarter (Unaudited) (Tables)
 12 Months Ended
Sep. 30, 2019
Notes Tables  
Quarterly Financial Information [Table Text Block]
   
Quarter ended
  
   
December 31
    
March 31
    
June 30
    
September 30
  
   
(in thousands except per share amounts)
  
2019
                                
Revenues
   $
10,428
     $
10,712
     $
14,518
     $
12,997
  
Costs and expenses
    
12,949
      
13,383
      
13,394
      
27,153
 *
Loss from operations
    
(2,521
 )    
(2,671
 )    
1,124
      
(14,156
 )
Other income, net
    
1,311
      
909
      
1,105
      
1,138
  
Unrealized (losses) gains on investments
    
(28,640
 )    
8,497
      
3,214
      
(786
 )
Loss before taxes
    
(29,850
 )    
6,735
      
5,443
      
(13,804
 )
Benefits from (provision for) income taxes
    
8,317
      
(1,717
 )    
(1,620
 )    
1,280
  
Net (loss) income
    
(21,533
 )    
5,018
      
3,823
      
(12,524
 )
Basic and diluted net (loss) income per share
    
(15.60
 )    
3.63
      
2.77
      
(9.06
 )
* Included goodwill impairment of $13.4 million
      
 
      
 
  
2018
                                
Revenues
   $
10,252
     $
9,338
     $
11,007
     $
10,106
  
Costs and expenses
    
13,697
      
13,711
      
13,716
      
13,639
  
Loss from operations
    
(3,445
 )    
(4,373
 )    
(2,709
 )    
(3,533
 )
Other income, net
    
1,334
      
4,041
      
1,027
      
879
  
Other-than-temporary impairment losses on investments
    
---
      
---
      
---
      
(4,560
 )
Loss before taxes
    
(2,111
 )    
(332
 )    
(1,682
 )    
(7,214
 )
Benefits from income taxes
    
16,850
      
100
      
710
      
1,880
  
Net income (loss)
    
14,739
      
(232
 )    
(972
 )    
(5,334
 )
Basic and diluted net income (loss) per share
    
10.67
      
(.17
 )    
(.70
 )    
(3.86
 )