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Note 23 - Lattice-based Valuation of Option Grants (Details) - $ / shares		12 Months Ended
	Jul. 27, 2020	Dec. 31, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average fair value of options granted		$ 1.50	$ 1.73
Weighted-average volatility		98.00%	90.00%
Weighted-average expected dividend yield		0.00%	0.00%
Lattice Based Valuation | Stock Option [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average fair value of options granted	$ 6.57
Range of risk-free interest rates	0.11%
Range of risk-free interest rates	0.30%
Weighted-average term	5 years 6 months 25 days
Weighted-average volatility	98.00%
Weighted-average expected dividend yield	0.00%

X

- Definition

Disclosure of the weighted average fair value of options granted.

+ References

No definition available.

+ Details

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- Definition

Share-based compensation arrangement by share-based payment award fair value assumptions weighted-average term.

+ References

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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X

- Definition

The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

No definition available.

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- Definition

The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

No definition available.

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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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