Note 9 - Stockholders' Equity - Summary of the Company's Stock Options (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Outstanding (in shares)	53,328
Exercisable (in shares)	39,996
Intrinsic Value | $	$ 50,477
Range One [Member]
Exercise Price (in dollars per share) | $ / shares	$ 5.60
Outstanding (in shares)	13,332
Weighted average remaining contractual life of options (Year)	4 years 335 days
Exercisable (in shares)
Intrinsic Value | $
Range Two [Member]
Exercise Price (in dollars per share) | $ / shares	$ 2.40
Outstanding (in shares)	13,332
Weighted average remaining contractual life of options (Year)	3 years 335 days
Exercisable (in shares)	13,332
Intrinsic Value | $	$ 20,225
Range Three [Member]
Exercise Price (in dollars per share) | $ / shares	$ 3.24
Outstanding (in shares)	13,332
Weighted average remaining contractual life of options (Year)	2 years 335 days
Exercisable (in shares)	13,332
Intrinsic Value | $	$ 9,026
Range Four [Member]
Exercise Price (in dollars per share) | $ / shares	$ 2.25
Outstanding (in shares)	6,666
Weighted average remaining contractual life of options (Year)	1 year 335 days
Exercisable (in shares)	6,666
Intrinsic Value | $	$ 11,113
Range Five [Member]
Exercise Price (in dollars per share) | $ / shares	$ 2.40
Outstanding (in shares)	6,666
Weighted average remaining contractual life of options (Year)	335 days
Exercisable (in shares)	6,666
Intrinsic Value | $	$ 10,113