Note 11 - Shareholders' Deficit / Stock Activity (Details Textual) - $ / shares $ / shares in Thousands	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Common Stock, No Par Value (in dollars per share)	$ 0	$ 0	$ 0
Convertible Debt [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	5,379,999	5,268,749

Aggregate number of common shares reserved for future issuance.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant