Quarterly report pursuant to Section 13 or 15(d)

Note 17 - Fair Value of Financial Instruments (Details) - Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation

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Note 17 - Fair Value of Financial Instruments (Details) - Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation
9 Months Ended
Feb. 28, 2019
USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]  
Balance $ 1,265,751
Transfers out due to the adoption of ASU 2017-11 effective June 1, 2018 (1,265,751)
Balance $ 0