Note 9 - Stock Option and Stock Plans - Stock Option Activity (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) $ / shares shares
Weighted Average Exercise Price, Outstanding (in dollars per share) | $ / shares
Weighted Average Exercise Price, Granted (in dollars per share) | $ / shares	$ 0.38	[1]
Weighted Average Remaining Contractual Term, Granted (Year)	5 years	[1]
Weighted Average Exercise Price, Outstanding (in dollars per share) | $ / shares	$ 0.38
Weighted Average Remaining Contractual Term, Outstanding (Year)	5 years
Aggregate Intrinsic Value, Outstanding | $
Qualified Options [Member]
Number of Options, Outstanding (in shares)
Number of Options, Granted (in shares)	950,000	[1]
Number of Options, Exercised (in shares)
Number of Options, Expired (in shares)
Number of Options, Outstanding (in shares)	950,000	[1]
Nonqualified Options [Member]
Number of Options, Outstanding (in shares)
Number of Options, Granted (in shares)	3,995,000	[1]
Number of Options, Exercised (in shares)
Number of Options, Expired (in shares)
Number of Options, Outstanding (in shares)	3,995,000

[1] There is one stock owner over 10% currently holding 500,000 qualified options. The exercise price for this option-holder would be $0.418 with an exercise period of 5 years and a vesting period of 4 years at 25% per year.