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Note 5 - Common Stock (Details Textual) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Mar. 31, 2022
Common Stock, No Par Value (in dollars per share)	$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)	1.1
Proceeds from Issuance of Common Stock	$ 8
Minimum [Member]
Shares Issued, Price Per Share (in dollars per share)	$ 3.27
Maximum [Member]
Shares Issued, Price Per Share (in dollars per share)	$ 15.00

X

- Definition

Face amount per share of no-par value common stock.

+ References

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-SubTopic 10
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-Paragraph 1
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X

- Definition

The cash inflow from the additional capital contribution to the entity.

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- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

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- Definition

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