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Note 8 - Secured Notes to Related Party (Details Textual) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 05, 2016 | Aug. 02, 2016 | Jul. 29, 2011 | Aug. 31, 2018 | Aug. 31, 2016 | Apr. 30, 2011 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Convertible Debt Issuable in Connection with Private Placement |  |  |  |  |  | $ 4,500,000 |  |  |
Proceeds from Convertible Debt |  |  |  |  |  | $ 4,300,000 |  |  |
Amortization of Debt Discount (Premium) |  |  |  |  |  |  | $ 890,000 | $ 773,000 | $ 689,000
Convertible Notes Payable, Related Parties, Current |  |  |  |  |  |  | 4,574,000 | 3,684,000 |
Interest Expense, Total |  |  |  |  |  |  | 2,672,000 | 3,937,000 | 2,664,000
Repayments of Long-term Debt, Total |  |  |  |  |  |  | 25,000,000 | 25,000,000 |
Interest Paid, Excluding Capitalized Interest, Operating Activities |  |  |  |  |  |  | 1,183,000 | 2,789,000 | 1,622,000
Convertible Debt [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 6.00% |  |  |
Debt Instrument Conversion Ratio Multiple of Principal |  |  |  |  |  | $ 1,000 |  |  |
Beneficial Ownership after Conversion |  |  |  |  |  | 9.99% |  |  |
Notice Period Associated with Beneficial Ownership Percentage Limitation Convertible Notes |  |  |  |  |  | 61 days |  |  |
Common Shares Registered for Resale in Connection with Convertible Notes |  |  | 3,500,000 |  |  |  |  |  |
Debt Instrument, Term |  |  |  |  |  | 10 years |  |  |
Paid-in-Kind Interest |  |  |  |  |  |  |  | 400,000 |
Debt Instrument, Increase (Decrease), Other, Net |  |  |  |  |  |  |  | 400,000 |
Amortization of Debt Discount (Premium) |  |  |  |  |  |  | 900,000 | 800,000 | 700,000
Debt Instrument, Face Amount |  |  |  |  |  |  | 6,800,000 |  |
Debt Instrument, Unamortized Discount, Total |  |  |  |  |  |  | $ 2,200,000 |  |
Debt Instrument, Convertible, Number Shares of Equity Insturments |  |  |  |  |  |  | 8,500,000 |  |
Interest Expense, Debt, Excluding Amortization |  |  |  |  |  |  | $ 400,000 | 400,000 | $ 400,000
Convertible Debt [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |
Debt Instrument Conversion Ratio Shares |  |  |  |  |  | 1,250 |  |  |
Term Loan [Member] | Tang Capital [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 8.00% |  |  |  |
Debt Instrument, Term |  |  |  |  | 2 years |  |  |  |
Debt Agreement, Maximum Borrowing Capacity |  |  |  |  | $ 100,000,000 |  |  |  |
Proceeds from Issuance of Long-term Debt, Total | $ 50,000,000 |  |  |  |  |  |  |  |
Proceeds from Issuance of Long-term Debt, Subject to Achievement of Corporate Milestone |  | $ 50,000,000 |  |  |  |  |  |  |
Debt Instrument, Fee Amount |  | $ 0 |  |  |  |  |  |  |
Debt Instrument, Number of Warrants |  | 0 |  |  |  |  |  |  |
Debt Instrument, Convertible, Beneficial Conversion Feature |  | $ 0 |  |  |  |  |  |  |
Interest Expense, Total |  |  |  |  |  |  | 1,200,000 | $ 2,800,000 |
Repayments of Long-term Debt, Total |  |  |  | $ 25,000,000 |  |  |  |  |
Interest Paid, Excluding Capitalized Interest, Operating Activities |  |  |  | $ 200,000 |  |  |  |  |
Long-term Debt, Total |  |  |  |  |  |  | $ 0 |  |

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