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Note 10 - Capital Lease (Tables)
9 Months Ended
Jan. 31, 2019
Notes Tables  
Schedule of Capital Leased Assets [Table Text Block]
   
January 31, 2019
 
Building
  $
1,699
 
Less accumulated depreciation
   
3
 
Total
  $
1,696
 
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]
2020
  $
93
 
2021
   
93
 
2022
   
93
 
2023
   
93
 
2024
   
93
 
Thereafter
   
4,159
 
Total minimum lease payments
   
4,624
 
Less amount representing interest
   
2,925
 
Present value of net minimum lease payments
   
1,699
 
Less current maturities of capital lease obligation
   
8
 
Long-term capital lease obligation
  $
1,691