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Note 13 - Financial Highlights (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Investment Company, Voluntary Fee Waived	$ 1.8	$ 1.2

X

- Definition

Amount of fee voluntarily waived by investment company.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 20
-Section 50
-Paragraph 7
-URI https://asc.fasb.org/extlink&oid=66023616&loc=d3e9046-115832

+ Details

Name:	us-gaap_InvestmentCompanyVoluntaryFeeWaived
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration