Note 18 - Equity Instruments - Outstanding Warrants (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Mar. 31, 2017
Exercise Price (in dollars per share)	$ 1.19
Number of Warrants (in shares)	16,932,517
Series BB [Member]
Exercise Price (in dollars per share)	$ 2
Number of Warrants (in shares)	300,000
Expiration Date	Jul. 07, 2018
Series HH Warrants [Member]
Exercise Price (in dollars per share)	$ 2.49
Number of Warrants (in shares)	301,205
Expiration Date	Jun. 25, 2023
Series II Warrants [Member]
Exercise Price (in dollars per share)	$ 3.04
Number of Warrants (in shares)	275,000
Expiration Date	Jun. 25, 2018
Series KK Warrants [Member]
Exercise Price (in dollars per share)	$ 1.918
Number of Warrants (in shares)	391,032
Expiration Date	Mar. 04, 2021
Series LL Warrants [Member]
Exercise Price (in dollars per share)	$ 0.01
Number of Warrants (in shares)	4,365,280
Expiration Date	Aug. 31, 2035
Series MM Warrants Expire September 2019 [Member]
Exercise Price (in dollars per share)	$ 2.50
Number of Warrants (in shares)	150,000
Expiration Date	Sep. 30, 2019
Series MM Warrants Expire October 2019 [Member]
Exercise Price (in dollars per share)	$ 2.50
Number of Warrants (in shares)	150,000
Expiration Date	Oct. 31, 2019
Series NN Warrants [Member]
Exercise Price (in dollars per share)	$ 1.50	$ 1.50
Number of Warrants (in shares)	11,000,000