Note I - Stockholders' Equity - Warrants (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Outstanding, number of shares (in shares)	1,592,775
Outstanding, weighted average exercise price (in dollars per share)	$ 2.55
Outstanding, weighted average remaining life (Year)	4 years 36 days	76 days
Outstanding, intrinsic value			$ 956,012
Issued, number of shares (in shares)	1,749,171
Issued, weighted average exercise price (in dollars per share)	$ 0.50
Issued, weighted average remaining life (Year)	4 years 36 days
Issued, intrinsic value	$ 1,556,762
Exercised, number of shares (in shares)	(675,000)
Exercised, weighted average exercise price (in dollars per share)	$ 0.50
Expired or cancelled, number of shares (in shares)	(1,592,775)
Expired or cancelled, weighted average exercise price (in dollars per share)	$ 2.55
Outstanding , number of shares (in shares)	1,074,171	1,592,775
Outstanding , weighted average exercise price (in dollars per share)	$ 0.50	$ 2.55
Exercisable at December 31, 2019 (in shares)	1,074,171	1,592,775	1,074,171	1,592,775
Exercisable at December 31, 2019 (in dollars per share)	$ 0.50	$ 2.55	$ 0.50	$ 2.55