Note 6 - Long-term Debt and Lease Obligation - Carrying Amount of the Company's Outstanding Debt (Details) (Parentheticals)	Dec. 31, 2016	Dec. 31, 2015
Senior Secured Debt, Due September 28, 2019 [Member]
Debt Instrument, Interest Rate, Stated Percentage	8.00%	8.00%
Convertible Note Instrument, Due March 5, 2018 [Member]
Debt Instrument, Interest Rate, Stated Percentage	7.00%	7.00%
Convertible Note Instrument, Due March 5, 2020 [Member]
Debt Instrument, Interest Rate, Stated Percentage	7.00%	7.00%