Note 12 - Subsequent Events (Details Textual) - USD ($)		1 Months Ended	2 Months Ended	3 Months Ended
	May 01, 2020	May 12, 2020	May 19, 2020	Mar. 31, 2020	Mar. 31, 2019
Class of Warrant or Right, Issued During Period (in shares)				791,260	3,861,041
Proceeds from Issuance of Common Stock				$ 901,000
Lincoln Park Capital Fund, LLC [Member]
Stock Issued During Period, Shares, New Issues (in shares)				1,398,223	0
Proceeds from Issuance of Common Stock				$ 295,000
Subsequent Event [Member]
Proceeds From Sale of Units	$ 142,000
Units Issued, Price Per Unit (in dollars per share)	$ 0.15
Stock Issued During Period, Shares, New Issues (in shares)	946,667
Class of Warrant or Right, Issued During Period (in shares)	1,893,334
Subsequent Event [Member] | Lincoln Park Capital Fund, LLC [Member]
Stock Issued During Period, Shares, New Issues (in shares)		500,000
Proceeds from Issuance of Common Stock		$ 73,000
Subsequent Event [Member] | Four Month Warrant [Member]
Warrant Exercise Price, Percent of Unit Price	120.00%
Subsequent Event [Member] | Five Year Warrant [Member]
Warrant Exercise Price, Percent of Unit Price	150.00%
BLEST [Member] | Subsequent Event [Member]
Proceeds From Paycheck Protection Program Under CARES Act			$ 93,000
Clyra [Member]
Proceeds from Issuance of Common Stock				$ 25,000
Clyra [Member] | Subsequent Event [Member]
Proceeds From Paycheck Protection Program Under CARES Act			$ 43,000
Clyra Medical Technologies [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues (in shares)		2,545
Proceeds from Issuance of Common Stock		$ 775,000