Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Subsequent Events (Details Textual)

v3.19.2
Note 7 - Subsequent Events (Details Textual) - Subsequent Event [Member]
$ / shares in Units, $ in Millions
1 Months Ended
Jul. 17, 2019
Jul. 31, 2019
USD ($)
$ / shares
shares
Underwritten Public Offering [Member]    
Number of Units Sold   416,315
Number of Prefunded Units Sold   2,361,462
Unit Price | $ / shares   $ 2.70
Proceeds from Issuance or Sale of Equity, Total | $   $ 7.5
Number of Common Stock in Each Unit   1
Number of Short-term Warrants in Each Unit   1
Number of Long-term Warrants in Each Unit   1
Number of Prefunded Warrants in Each Prefunded Unit   1
Number of Short-term Warrants in Each Prefunded Unit   1
Number of Long-term Warrants in Each Prefunded Unit   1
Proceeds from Issuance or Sale of Equity, Net of Issuance Costs | $   $ 6.6
Underwritten Public Offering [Member] | Prefunded Warrants [Member]    
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 0.0001
Underwritten Public Offering [Member] | Short-term Warrants [Member]    
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   2.70
Underwritten Public Offering [Member] | Long-term warrants [Member]    
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 2.70
Warrants and Rights Outstanding, Term   5 years
Over-Allotment Option [Member]    
Underwriters, Additional Common Shares Authorized to Purchase   416,666
Underwriters, Additional Warrants Authorized to Purchase   416,666
Reverse Stock Split [Member]    
Stockholders' Equity Note, Stock Split, Conversion Ratio 20