Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical)

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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical)
12 Months Ended
May 31, 2018
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Statement of Stockholders' Equity [Abstract]  
Sale of units, net of underwriting discount and offering expenses, number of units sold 5,200,000
Sale of private units, number of units sold 261,500