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Note 7 - Stockholders' Equity - Warrants Outstanding by Exercise Price (Details) - $ / shares
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Exercise prices of warrants (in dollars per share)   $ 6.60
Warrants outstanding (in shares) 25,000  
Warrants outstanding, weighted average remaining contractual life (Year) 1 year 43 days  
Warrants outstanding, weighted average exercise price (in dollars per share) $ 2.96  
Warrants exercisable (in shares) 25,000  
Warrants exercisable, weighted average exercise price (in dollars per share) $ 2.96  
Warrant 1 [Member]    
Exercise prices of warrants (in dollars per share) $ 2.96  
Warrants outstanding (in shares) 25,000  
Warrants outstanding, weighted average remaining contractual life (Year) 1 year 43 days  
Warrants outstanding, weighted average exercise price (in dollars per share) $ 2.96  
Warrants exercisable (in shares) 25,000  
Warrants exercisable, weighted average exercise price (in dollars per share) $ 2.96