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Note 6 - Long-term Debt and Lease Obligation - Carrying Amount of the Company's Outstanding Debt (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Convertible note instrument $ 71,000,000  
Lease Obligation 14,831,000 $ 13,720,000
Other loans 104,000 160,000
Debt discount and debt issuance costs, net of accumulated accretion (4,778,000) (8,988,000)
Debt, gross 150,716,000 138,452,000
Less current portion 59,000 1,408,000
Debt, non-current 150,657,000 137,044,000
Senior Secured Debt, Due March 25, 2021 [Member]    
Senior secured debt 67,401,000 62,701,000
Convertible Note Instrument, Due March 5, 2018 [Member]    
Convertible note instrument 1,371,000
Convertible Note Instrument, Due March 5, 2020 [Member]    
Convertible note instrument $ 73,158,000 $ 69,488,000