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Note 7 - Lease Commitments (Tables)
 3 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Debt [Table Text Block]
   
As of
 
   
December 31
,
2018
    
September 30,
201
8
  
Capital lease finance obligations, due in monthly installments through fiscal year 2033
   $
35,104
      
32,523
  
Capital lease obligations, due in monthly installments through fiscal year 2041
    
6,200
      
4,763
  
Capital lease finance obligations for assets under construction, due in monthly installments through fiscal year 2034
    
4,350
      
2,350
  
Capital lease obligations for assets under construction, due in monthly installments through fiscal year 2034
    
—
      
1,506
  
Total capital and financing lease obligations
    
45,654
      
41,142
  
Less current portion
    
(805
)
    
(736
)
Total capital and financing lease obligations, net of current portion
   $
44,849
      
40,406