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Note 3 - Financed Lease Right-of-use (Tables)
12 Months Ended
Apr. 30, 2020
Notes Tables  
Lessee, Finance Lease, Right of Use Assets [Table Text Block]
   
April 30, 2020
   
April 30, 2019
 
Finance lease right-of-use assets
  $
44,349
    $
1,699
 
Less accumulated depreciation
   
2,844
     
11
 
Total
  $
41,505
    $
1,688
 
Finance Lease, Liability, Fiscal Year Maturity [Table Text Block]
2021
  $
5,236
 
2022
   
5,242
 
2023
   
5,287
 
2024
   
5,341
 
2025
   
5,267
 
Thereafter
   
59,618
 
Total minimum lease payments
   
85,991
 
Less amount representing interest
   
42,617
 
Present value of net minimum lease payments
   
43,374
 
Less current maturities of finance lease liability
   
1,163
 
Finance lease liability, net of current maturities
  $
42,211
 
Accounting Standards Update and Change in Accounting Principle [Table Text Block]
Increase in depreciation
  $
2,833
 
Increase in interest expense
   
4,167
 
Decrease in rent expense
   
(5,150
)
Decrease in net income for the year ended April 30, 2020
  $
1,850