Note I - Stockholders' Equity - Warrants (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Outstanding , number of shares (in shares)	6,369,396
Outstanding , weighted average exercise price (in dollars per share)	$ 1.97
Outstanding, weighted average remaining life (Year)	1 year 6 months	2 years 5 months 23 days
Outstanding, intrinsic value	$ 1,187,546	$ 2,784,117
Issued, number of shares (in shares)	0
Issued, weighted average exercise price (in dollars per share)	$ 0
Exercised, number of shares (in shares)	(2,101,175)
Exercised, weighted average exercise price (in dollars per share)	$ 1.50
Expired or cancelled (in shares)
Expired or cancelled, weighted average exercise price (in dollars per share)	$ 0
Outstanding and exercisable at December 31, 2021 (in shares)	4,268,221	6,369,396
Outstanding and exercisable at December 31, 2021 (in dollars per share)	$ 2.18	$ 1.97