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Note 8 - Convertible Debt (Details Textual) - USD ($) |  | 3 Months Ended | 12 Months Ended | 73 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 27, 2016 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 08, 2016
Interest Expense |  |  | $ 100,000 | $ 37,000 |  |
Interest Payable |  |  | 37,000 | 29,000 |  |
Litigation Settlement, Expense |  |  |  | 2,500,000 |  |
Repayments of Convertible Debt |  |  | 1,880,000 |  |  |
Interest Paid, Net |  |  | 112,800 |  |  |
Convertible Notes Payable |  |  | 550,000 | 2,430,000 |  |
Debt Conversion, Original Debt, Amount |  |  |  | 700,000 |  |
Debt Conversion, Converted Instrument, Related Accrued Interest |  |  |  | 16,000 |  |
Diffusion LLC [Member] |  |  |  |  |  |
Convertible Notes Payable |  |  |  |  |  | $ 1,100,000
The 2016 Convertible Notes [Member] |  |  |  |  |  |
Repayments of Convertible Debt |  | $ 1,900,000 |  |  |  |
Interest Paid, Net |  | $ 100,000 |  |  |  |
Convertible Notes Payable |  |  |  | 1,880,000 |  |
The 2016 Convertible Notes [Member] | Settlement Agreement [Member] |  |  |  |  |  |
Debt Instrument, Face Amount | $ 1,900,000 |  |  |  |  |
Debt Instrument, Term | 1 year |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.00% |  |  |  |  |
Litigation Settlement, Expense | $ 2,500,000 |  |  |  |  |
Convertible Notes [Member] |  |  |  |  |  |
Proceeds from Issuance of Unsecured Debt |  |  |  |  | $ 22,400,000 |
Debt Instrument, Interest Rate, Effective Percentage |  |  | 1.00% |  |  |
Qualified Financing, Minimum Amount of Gross Proceeds |  |  | $ 50,000,000 |  |  |
Convertible Notes Payable |  |  | $ 550,000 | $ 550,000 |  |
Debt Conversion, Converted Instrument, Shares Issued |  |  |  | 217,122 |  |
Convertible Notes [Member] | Minimum [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 1.00% |
Convertible Notes [Member] | Maximum [Member] |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 1.50% |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(13)) -URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e603758-122996 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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