Note 17 - Income Taxes - Components of Deferred Tax Assets (Details) - USD ($) |
Dec. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Deferred tax assets: | ||
| Net operating loss carryforwards | $ 29,597,313 | $ 29,570,581 |
| R&D credit carryforwards | 9,067,874 | 10,043,714 |
| AMT credit carryforward | 621,240 | 1,229,979 |
| Stock compensation | 375,731 | 576,024 |
| Intangibles | 550,797 | 591,651 |
| Gain/loss from discontinued operations | (2,510,699) | |
| Disallowed interest expense | 878,929 | |
| Temporary differences | 480,888 | 207,447 |
| Deferred tax assets before valuation allowance | 41,572,772 | 39,708,697 |
| Valuation allowance | (40,951,532) | (38,478,718) |
| Net deferred tax assets | $ 621,240 | $ 1,229,979 |
| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to disallowed interest expense. No definition available.
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to gain/loss form discontinued operations. No definition available.
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to research and development tax credit carryforwards. No definition available.
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to temporary differences. No definition available.
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from intangible assets including goodwill. No definition available.
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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