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Note 13 - Warrants (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables
Schedule of Warrant Activity [Table Text Block]
Warrants
Number of
Warrants
Issued
Weighted
Average
Exercise
Price
Warrants outstanding at January 1, 2015
5,069,815
$
8.18
Warrants issued in connection with the May 2015 equity transaction
1,950,000
$
2.60
Warrants expired during 2015
(1,125,140
)
$
7.98
Warrants outstanding at December 31, 2015
5,894,675
$
6.37
Warrants issued in connection with the 2016 equity transactions
16,066,371
$
0.92
Warrants exercised during 2016
(250,000
)
$
0.01
Warrants expired during 2016
(879,163
)
$
14.94
Warrants outstanding at December 31, 2016
20,831,883
$
1.88
Aggregate intrinsic value of outstanding warrants at December 31, 2016
$
534,000
Weighted average remaining contractual terms (years)
3.32
(1)
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