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Note 10 - Deferred Revenue (Tables)
 3 Months Ended
Jun. 30, 2019
Statement Line Items [Line Items]  
Explanation of significant changes in contract assets and contract liabilities [text block]
    Three months        
    ended     Year ended  
    June 30,     March 31,  
    2019     2019  
Balance, beginning of period   $
43,228
     $
38,710
  
Additions to deferred revenue    
16,154
      
569,880
  
Revenue recognized during the period    
(22,959
 )    
(563,922
 )
Foreign exchange impact    
(586
 )    
(1,440
 )
Liabilities held for sale    
(32,538
 )    
-
  
Balance, end of period   $
3,299
     $
43,228