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Note 18 - Stockholders' Equity - Option and Warrant Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Outstanding, options (in shares)	471,144	471,144
Outstanding, weighted average exercise price (in dollars per share)	$ 3.95	$ 3.95
Outstanding, warrants (in shares)
Outstanding, warrants, weighted average exercise price (in dollars per share)
Granted, options (in shares)
Granted, weighted average exercise price (in dollars per share)
Granted, warrants (in shares)	792,660
Granted, warrants, weighted average exercise price (in dollars per share)	$ 1
Cancelled/Expired, options (in shares)	(471,144)
Cancelled/Expired, weighted average exercise price (in dollars per share)	$ 3.95
Cancelled/Expired, warrants (in shares)
Cancelled/Expired, warrants, weighted average exercise price (in dollars per share)
Exercised/Issued, options (in shares)
Exercised/Issued, weighted average exercise price (in dollars per share)
Exercised/Issued, warrants (in shares)	(597,500)
Exercised/Issued, warrants, weighted average exercise price (in dollars per share)	$ 1
Outstanding, options (in shares)		471,144
Outstanding, weighted average exercise price (in dollars per share)		$ 3.95
Outstanding, warrants (in shares)	195,160
Outstanding, warrants, weighted average exercise price (in dollars per share)	$ 1
Exercisable at the end of period, options (in shares)	312,020
Exercisable at the end of period, weighted average exercise price (in dollars per share)
Exercisable at December 31, 2020, warrants (in shares)	195,160
Exercisable at December 31, 2020, warrants, weighted average exercise price (in dollars per share)	$ 1

X

- Definition

The number of warrants or rights cancelled during period.

+ References

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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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