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Note 10 - Commitments and Contingencies (Details Textual) - USD ($) |  | 12 Months Ended
--- | --- | ---
Sep. 27, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Litigation Settlement, Expense |  | $ 2,500,000 | $ 0
2016 Convertible Notes [Member] |  |  |
Debt Instrument, Convertible, Conversion Price |  | $ 3.50 |
Settlement Agreement [Member] | 2016 Convertible Notes [Member] |  |  |
Debt Instrument, Face Amount | $ 1,900,000 |  |
Debt Instrument, Convertible, Conversion Price | $ 3.50 |  |
Litigation Settlement, Expense | $ 2,500,000 |  |
Charlottesville, Virginia [Member] | Building [Member] |  |  |
Operating Leases, Rent Expense, Net |  | $ 66,000 | $ 66,000

X
- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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