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Note 11 - Fair Value Measurements (Tables)
 12 Months Ended
Apr. 30, 2017
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
 
 
Level 1
 
 
Level 2
 
 
Level 3
 
 
Fair Value
 
Promissory notes
 
$
-
 
 
$
-
 
 
$
2,604
 
 
$
2,604
 
Long-term debt
 
 
 
 
 
 
 
 
 
 
 
5,644
 
 
 
 
5,644
 
 
 
$
-
 
 
$
-
 
 
$
8,248
 
 
$
8,248
 
 
 
Level 1
 
 
Level 2
 
 
Level 3
 
 
Fair Value
 
Promissory notes
 
$
-
 
 
$
-
 
 
$
3,988
 
 
$
3,988
 
Long-term debt
 
 
-
 
 
 
-
 
 
 
7,682
 
 
 
7,682
 
 
 
$
-
 
 
$
-
 
 
$
11,670
 
 
$
11,670