Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.

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

Note 11 - Stockholders' Equity (Details Textual) - USD ($)		3 Months Ended		6 Months Ended
	May 09, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019
Stock Issued During Period, Value, New Issues			$ 7,407,000
ATM Agreement [Member]
Aggregate Offering Price, Increase During Period	$ 40,000,000
Stock Issued During Period, Value, New Issues		$ 0		$ 0
Public Offering [Member]
Aggregate Offering Price, Maximum				$ 46,564,331