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Note 5 - Share-based Compensation (Details Textual) - $ / shares

3 Months Ended

Apr. 16, 2021

Mar. 22, 2021

Jan. 21, 2021

Jan. 08, 2021

Jan. 04, 2021

Jan. 01, 2019

Mar. 31, 2021

Mar. 31, 2020

Dec. 31, 2020

Apr. 28, 2011

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)

5,324,215

4,638,390

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)

^[1]

745,825

Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)

^[1]

$ 5.25

Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)

^[2]

60,000

Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in dollars per share)

$ 1.93

^[2]

$ 1.78

Minimum [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)

2 years

Executives and Key Personnel [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)

417,500

Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)

$ 5.16

Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period (Year)

1 year

Director [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)

35,000

227,500

Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)

$ 5.50

$ 5.16

Employees [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)

23,325

Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)

$ 5.16

Consultant [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)

30,000

7,500

5,000

Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in dollars per share)

$ 6.87

$ 5.65

$ 5.16

Share-based Payment Arrangement, Option [Member] | Director [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)

1 year

1 year

Share-based Payment Arrangement, Option [Member] | Employees [Member] | Minimum [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)

4 years

Share-based Payment Arrangement, Option [Member] | Consultant [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)

1 year

1 year

1 year

Share-based Payment Arrangement, Option [Member] | Share-based Compensation Award Tranche Two through Five [Member] | Executives and Key Personnel [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)

4 years

The 2011 Plan [Member]

Common Stock, Capital Shares Reserved for Future Issuance (in shares)

3,000,000

Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)

1,500,000

Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)

5,324,215

4,638,390

Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)

1,388,386

2,134,211

The 2011 Plan [Member] | Share-based Payment Arrangement, Option [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)

10 years

The 2011 Plan [Member] | Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Tranche One [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)

1 year

The 2011 Plan [Member] | Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Tranche One [Member] | Contractor [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)

2 years

The 2011 Plan [Member] | Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Tranche One [Member] | Chief Executive Officer [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)

5 years

The 2011 Plan [Member] | Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Tranche Two [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)

3 years

The 2011 Plan [Member] | Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Tranche Two [Member] | Contractor [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)

3 years

The 2011 Plan [Member] | Share-based Payment Arrangement, Option [Member] | Share-based Payment Arrangement, Tranche Two [Member] | Chief Executive Officer [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term (Year)

10 years

The 2011 Plan [Member] | Subsequent Event [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)

3,000,000

[1]

Represents the following stock options granted: Annual share-based compensation awards on January 4, 2021, including: (a) 417,500 stock options with an exercise price of $5.16 per share granted to executives and key personnel, upon one year anniversary, or vesting annually in equal installments over four years, (b) 227,500 stock options with an exercise price of $5.16 per share granted to members of the Board of Directors, vesting upon one year anniversary, (c) 23,325 stock options with an exercise price of $5.16 per share granted to employees, vesting annually in equal installments over four years and (d) 5,000 stock options with an exercise price of $5.16 per share granted to a consultant, vesting upon one year anniversary. One-time award on January 8, 2021, 35,000 stock options with an exercise price of $5.50 per share granted to a new member of the Board of Directors, vesting in one year from the grant date. One-time award on January 21, 2021, 7,500 stock options with an exercise price of $5.65 per share granted to a consultant, vesting in one year from the grant date. One-time award on March 22, 2021, 30,000 stock options with an exercise price of $6.87 per share granted to a consultant, vesting in one year from the grant date.

[2]

Represents the following stock options exercised: A total of 60,000 stock options exercised with a weighted average exercise price of $1.93.

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- Definition

Aggregate number of common shares reserved for future issuance.

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