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Note 3 - Basis of Presentation and Summary of Significant Accounting Policies - Basic and Diluted Earnings Per Share (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Basic net loss per common share calculation:    
Net loss $ (1,364,518) $ (18,036,619)
Accretion of Series A cumulative preferred dividends (1,252,394)
Net loss attributable to common stockholders $ (2,616,912) $ (18,036,619)
Weighted average shares outstanding, basic (in shares) 12,447,641 10,232,791
Net loss per share of common, basic (in dollars per share) $ (0.21) $ (1.76)
Diluted net loss per common share calculation:    
Net loss attributable to common stockholders $ (2,616,912) $ (18,036,619)
Change in fair value of warrant liability (22,072,322)
Diluted net loss $ (24,689,234) $ (18,036,619)
Weighted average shares outstanding, basic (in shares) 12,447,641 10,232,791
Common stock equivalents arising from warrants (in shares) 307,675
Common stock equivalents (in shares) 12,755,316 10,232,791
Net loss per share of common stock, diluted (in dollars per share) $ (1.94) $ (1.76)