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Note 10 - Significant Customers / Concentration / Disaggregated Revenue (Details Textual)	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Geographic Concentration Risk [Member] | Assets, Total [Member] | DENMARK
Concentration Risk, Percentage	100.00%	100.00%

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
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