Quarterly report pursuant to Section 13 or 15(d)

Note 1 - Business, Basis of Presentation and Liquidity (Details Textual)

v3.7.0.1
Note 1 - Business, Basis of Presentation and Liquidity (Details Textual)
1 Months Ended 6 Months Ended
Aug. 01, 2017
USD ($)
$ / shares
shares
Jan. 06, 2017
May 31, 2016
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Apr. 30, 2017
$ / shares
Mar. 31, 2017
$ / shares
Number of Operating Segments       1      
Cash, Cash Equivalents, and Short-term Investments       $ 11,400,000      
Proceeds from Issuance or Sale of Equity, Net of Issuance Costs       $ 97,050 $ 8,308,931    
Stock Purchase Warrants [Member]              
Class of Warrant or Right, Issued During Period | shares     1,746,173        
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares           $ 3.25 $ 3.25
Subsequent Event [Member]              
Stock Issued During Period, Shares, New Issues | shares 3,000,000            
Share Price | $ / shares $ 2            
Proceeds from Issuance or Sale of Equity $ 6,000,000            
Proceeds from Issuance or Sale of Equity, Net of Issuance Costs $ 5,400,000            
Subsequent Event [Member] | Stock Purchase Warrants [Member]              
Class of Warrant or Right, Issued During Period | shares 2,250,000            
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares $ 2            
Reverse Stock Split [Member]              
Stockholders' Equity Note, Stock Split, Conversion Ratio   13