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Note 13 - Subsequent Events (Details Textual) - shares				1 Months Ended
	Aug. 09, 2017	May 11, 2017	May 11, 2016	May 31, 2017
Stock Issued During Period, Shares, Issued for Services				61,667
Director [Member]
Stock Issued During Period, Shares, Issued for Services		1,925	41,174
Director [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, Issued for Services	5,148

X

- Definition

Number of shares issued in lieu of cash for services contributed to the entity. Number of shares includes, but is not limited to, shares issued for services contributed by vendors and founders.

+ References

No definition available.

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_TitleOfIndividualAxis=us-gaap_DirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: