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17. Subsequent Events	12 Months Ended
17. Subsequent Events	Apr. 30, 2019
Subsequent Events [Abstract]
Subsequent Events [Text Block]	17. Subsequent Events On May 21, 2019, the Company completed the sale of its wholly-owned subsidiary FEI-Asia to an Asian corporation. FEI-Asia was sold for $130,000 in addition to all rights, benefits and obligations attached thereto, free and clear from any encumbrance. The results of this transaction, including approximately $85,000 of income for the twenty-one days in May 2019, are included in the consolidated financial statements for the fiscal year ended April 30, 2019. The above transaction resulted in a consolidated loss of approximately $1 million.