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Note 15 - Restatement to Previously Issued Condensed Consolidated Financial Statements (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]
 
 
For the Three Months Ended
June 30, 2018
 
 
For the Six Months Ended
June 30, 2018
 
 
 
Previously
Reported
 
 
Restated
 
 
Previously
Reported
 
 
Restated
 
Deemed dividend attributable to preferred stock
 
$
(4,782,100
)
 
$
(11,479,308
)
 
$
(4,782,100
)
 
$
(11,479,308
)
Net loss applicable to common stockholders
 
$
(8,924,677
)
 
$
(15,621,885
)
 
$
(10,799,059
)
 
$
(17,496,267
)
Loss per common share -basic and diluted
 
$
(2.90
)
 
$
(5.08
)
 
$
(3.77
)
 
$
(6.11
)
 
 
Preferred Stock Additional Paid-in Capital
 
 
Common Stock Additional Paid-in Capital
 
 
 
Previously
Reported
 
 
Restated
 
 
Previously
Reported
 
 
Restated
 
Issuance of Series B convertible preferred stock, net of issuance costs
 
$
12,290,537
 
 
$
6,926,778
 
 
$
0
 
 
$
5,363,759
 
Deemed Dividend on Series B convertible preferred stock
 
$
4,782,100
 
 
$
11,479,308
 
 
$
(4,782,100
)
 
$
(11,479,308
)
Conversion of Series B convertible preferred stock to common stock
 
$
(7,056,421
)
 
$
(7,821,992
)
 
$
6,656,442
 
 
$
7,422,013