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Note 17 - Stock Option and Purchase Plans - Summary of Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Outstanding (in shares)	2,567,750
Outstanding, weighted average exercise price per share (in dollars per share)	$ 1.26
Granted (in shares)	930,000
Granted, weighted average exercise price per share (in dollars per share)	$ 0.82
Exercised (in shares)	(306,500)	0
Exercised, weighted average exercise price per share (in dollars per share)	$ 0.96
Forfeited (in shares)	0
Forfeited, weighted average exercise price per share (in dollars per share)	$ 0
Expired (in shares)	(445,000)
Expired, weighted average exercise price per share (in dollars per share)	$ 1.50
Outstanding (in shares)	2,746,250	2,567,750
Outstanding, weighted average exercise price per share (in dollars per share)	$ 1.10	$ 1.26
Outstanding, weighted average remaining term (Year)	2 years 354 days
Outstanding, aggregate intrinsic value	$ 1,211,995
Exercisable (in shares)	517,000
Exercisable, weighted average exercise price per share (in dollars per share)	$ 1.04
Exercisable, weighted average remaining term (Year)	270 days
Exercisable, aggregate intrinsic value	$ 250,500

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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

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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 of the plan that expired.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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