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Note 11 - Stockholders' Equity - Stock by Class (Details) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Common stock shares authorized (in shares)	125,000,000	125,000,000
Common stock par value (in dollars per share)	$ 0.001	$ 0.001
Common stock shares issued (in shares)	40,704,984	39,941,327
Preferred stock shares authorized (in shares)	3,000,000	3,000,000
Preferred Stock, No Par Value (in dollars per share)	$ 0	$ 0
Preferred stock shares issued (in shares)	0	0

X

- Definition

Face amount or stated value per share of common stock.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

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- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

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Face amount per share of no-par value preferred stock nonredeemable or redeemable solely at the option of the issuer.

+ References

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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