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Note 12 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2015
Notes Tables |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | December 31, |
Deferred Tax Assets |  | 2015 |  |  | 2014 |
Net operating loss carryforwards |  | $ | 25,165,014 |  |  | $ | 23,030,884 |
Stock option compensation |  |  | 6,937,512 |  |  |  | 6,083,848 |
Other |  |  | — |  |  |  | 26,783 |
Valuation allowance |  |  | (32,102,526 | ) |  |  | (29,141,515 | )
Net deferred tax asset |  | $ | — |  |  | $ | — |
Deferred Tax Liabilities |  |  |  |  |  |  |  |
Intangible assets |  | $ | (2,274,526 | ) |  | $ | (2,274,526 | )
Summary of Operating Loss Carryforwards [Table Text Block] |
|  | December 31, |
|  | 2015 |  |  | 2014 |
Combined NOL Carryforwards: |  |  |  |  |  |  |  |
Federal |  | $ | 63,013,194 |  |  | $ | 57,521,560 |
State |  |  | 54,131,507 |  |  |  | 50,440,965 |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | 2015 |  |  | 2014 |
Rate reconciliation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal tax benefit at statutory rate |  | $ | (8,337,236 | ) |  |  | (35.0 | %) |  | $ | (6,009,398 | ) |  |  | (35.0 | %)
State tax, net of Federal benefit |  |  | (1,368,216 | ) |  |  | (5.7 | %) |  |  | (986,051 | ) |  |  | (5.7 | %)
Change in valuation allowance |  |  | 2,961,011 |  |  |  | 12.4 | % |  |  | 2,866,582 |  |  |  | 10.9 | %
Goodwill impairment |  |  | 4,510,986 |  |  |  | 18.9 | % |  |  | — |  |  |  | — |
Other |  |  | 2,233,455 |  |  |  | 9.4 | % |  |  | 1,311,983 |  |  |  | 13.4 | %
Total provision |  | $ | — |  |  |  | 0.0 | % |  | $ | (2,816,884 | ) |  |  | (16.4 | %)

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of pertinent information, such as tax authority, amounts, and expiration dates, of net operating loss carryforwards, including an assessment of the likelihood of utilization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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