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Note 8 - Significant Customers / Concentration / Disaggregated Revenue (Details Textual) - Geographic Concentration Risk [Member] - Assets, Total [Member]	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
DENMARK
Concentration Risk, Percentage	95.00%	91.00%
UNITED STATES
Concentration Risk, Percentage	5.00%	9.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

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