Note 14 - Fair Value of Financial Instruments (Details) - Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation |
3 Months Ended |
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Aug. 31, 2018
USD ($)
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| 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 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of transfers of financial instrument classified in shareholders' equity out of level 3 of the fair value hierarchy. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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