Quarterly report pursuant to Section 13 or 15(d)

Note 8 - Stockholders' Equity - Warrants (Details)

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Note 8 - Stockholders' Equity - Warrants (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Outstanding, number of shares (in shares) 1,500,000  
Outstanding, weighted average exercise price (in dollars per share) $ 2.55  
Outstanding, weighted average remaining life (Year) 2 years 343 days 266 days
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 310 days  
Exercised, number of shares (in shares)  
Exercised, weighted average exercise price (in dollars per share)  
Expired or cancelled, number of shares (in shares)  
Expired or cancelled, weighted average exercise price (in dollars per share)  
Outstanding , number of shares (in shares) 3,249,171 1,500,000
Outstanding , weighted average exercise price (in dollars per share) $ 1.45 $ 2.55
Exercisable , number of shares (in shares) 3,249,171  
Exercisable, weighted average exercise price (in dollars per share) $ 1.45  
Exercisable, weighted average remaining life (Year) 2 years 343 days