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Note 6 - Common Stock Options - Changes in Common Stock Options Issued (Details) - $ / shares	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Options outstanding (in shares)	6,965,730
Granted (in shares)	214,500
Exercised (in shares)	(1,704,905)	(771,000)
Forfeitures (in shares)	(57,042)
Options outstanding (in shares)	5,418,283	6,965,730
Minimum [Member]
Options outstanding, exercise price (in dollars per share)	$ 2.71
Granted, exercise price (in dollars per share)	8.89
Exercised, exercise price (in dollars per share)	2.71
Forfeitures, exercise price (in dollars per share)	4.26
Options outstanding, exercise price (in dollars per share)	2.71	$ 2.71
Maximum [Member]
Options outstanding, exercise price (in dollars per share)	21.99
Granted, exercise price (in dollars per share)	14.77
Exercised, exercise price (in dollars per share)	19.09
Forfeitures, exercise price (in dollars per share)	21.80
Options outstanding, exercise price (in dollars per share)	21.99	21.99
Weighted Average [Member]
Options outstanding, exercise price (in dollars per share)	6.09
Granted, exercise price (in dollars per share)	16.71
Exercised, exercise price (in dollars per share)	6.11
Forfeitures, exercise price (in dollars per share)	8.53
Options outstanding, exercise price (in dollars per share)	$ 6.20	$ 6.09

X

- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ 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 (c)(1)(iv)(3)
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- Definition

Gross number of share options (or share units) granted during the period.

+ References

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Number of options outstanding, including both vested and non-vested options.

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-Topic 718
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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