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Note 6 - Convertible Notes to Related Parties (Details Textual) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 29, 2011 shares | Apr. 30, 2011 USD ($) shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Convertible Debt Securities [Member] | Common Stock [Member] |  |  |  |  |
Debt Instrument Conversion Ratio Shares | shares |  | 1,250 |  |  |
Convertible Debt Securities [Member] | In Case of Debt Conversion [Member] |  |  |  |  |
Debt Instrument, Face Amount |  |  | $ 5,669,000 |  |
Debt Instrument, Convertible, Number of Equity Instruments |  |  | 7,086,560 |  |
Convertible Debt Securities [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 |  |  |
Paid-in-Kind Interest |  |  | $ 328,000 |  |
Debt Instrument, Increase (Decrease), Other, Net |  |  | 328,000 |  |
Convertible Notes Payable, Related Parties, Current |  |  | 2,222,000 |  |
Debt Instrument, Face Amount |  |  | 5,669,000 |  |
Debt Instrument, Unamortized Discount |  |  | 3,447,000 |  |
Convertible Debt Issuable in Connection with Private Placement |  | $ 4,500,000 |  |  |
Proceeds from Convertible Debt |  | $ 4,300,000 |  |  |
Common Shares Registered for Resale in Connection with Convertible Notes | shares | 3,500,000 |  |  |  |
Interest Expense, Debt, Excluding Amortization |  |  | 333,000 | $ 314,000 | $ 295,000
Amortization of Debt Discount (Premium) |  |  | 624,000 | 573,000 | $ 533,000
Convertible Notes Payable, Related Parties, Current |  |  | $ 2,222,000 | $ 1,598,000 |

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