Note J - Stock Option Plans - Summary of Option Activity for Employees and Non-employees (Details) - USD ($)	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Nov. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement, Option [Member]
Number of options (in shares)		1,670,221	1,670,221	1,985,335
Weighted average exercise price, outstanding (in dollars per share)		$ 1.71	$ 1.71	$ 1.74
Weighted average remaining contractual life, outstanding (Year)			2 years	2 years 146 days	3 years 14 days
Aggregate intrinsic value, outstanding	$ 114,570		$ 114,570		$ 25,160
Number of options granted (in shares)	592,358	592,358
Weighted average exercise price, granted (in dollars per share)
Weighted average remaining contractual life, granted (Year)
Number of options exercised (in shares)
Weighted average exercise price, exercised (in dollars per share)
Number of options forfeited and expired (in shares)			(457,779)	(315,114)
Number of options exercisable (in shares)	1,117,834		1,117,834	1,317,632
Weighted average exercise price, exercisable (in dollars per share)	$ 1.65		$ 1.65	$ 1.79
Weighted average remaining contractual life, exercisable (Year)			1 year 328 days	2 years 54 days
Aggregate intrinsic value, exercisable	$ 88,982		$ 88,982
Forfeited or expired (in dollars per share)			$ 1.96
Number of options exercised (in shares)
Number of options (in shares)	1,212,442		1,212,442	1,670,221	1,985,335
Weighted average exercise price, outstanding (in dollars per share)	$ 1.61		$ 1.61	$ 1.71	$ 1.74
Non-employee Options [Member]
Number of options (in shares)		33,332	33,332	224,999
Weighted average exercise price, outstanding (in dollars per share)		$ 1.87	$ 1.87	$ 2.53
Weighted average remaining contractual life, outstanding (Year)			2 years 343 days	2 years 343 days	4 years 116 days
Aggregate intrinsic value, outstanding	$ 19,333		$ 19,333
Number of options granted (in shares)			16,666	8,333
Weighted average exercise price, granted (in dollars per share)			$ 0.55	$ 0.75
Weighted average remaining contractual life, granted (Year)			4 years 156 days	4 years 120 days
Number of options exercised (in shares)
Weighted average exercise price, exercised (in dollars per share)
Number of options forfeited and expired (in shares)				(200,000)
Number of options exercisable (in shares)	36,109		36,109	27,777
Weighted average exercise price, exercisable (in dollars per share)	$ 1.76		$ 1.76	$ 2.10
Weighted average remaining contractual life, exercisable (Year)			2 years 160 days	2 years 240 days
Aggregate intrinsic value, exercisable	$ 8,222		$ 8,222
Forfeited or expired (in dollars per share)				$ 2.55
Number of options exercised (in shares)
Aggregate intrinsic value, granted			$ 13,999
Number of options (in shares)	49,998		49,998	33,332	224,999
Weighted average exercise price, outstanding (in dollars per share)	$ 1.43		$ 1.43	$ 1.87	$ 2.53