Note 16 - Income Taxes - Components of Deferred Tax Assets (Details) - USD ($) |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Deferred tax assets: | ||
| Net operating loss carryforwards | $ 31,966,658 | $ 29,597,313 |
| R&D credit carryforwards | 9,150,580 | 9,067,874 |
| AMT credit carryforward | 310,620 | 621,240 |
| Stock compensation | 382,016 | 375,731 |
| Intangibles | 610,783 | 550,797 |
| Disallowed interest expense | 857,648 | 878,929 |
| Temporary differences | 333,728 | 480,888 |
| Deferred tax assets before valuation allowance | 43,612,033 | 41,572,772 |
| Valuation allowance | (43,301,413) | (40,951,532) |
| Net deferred tax assets | $ 310,620 | $ 621,240 |
| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to disallowed interest expense. No definition available.
|
| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to research and development tax credit carryforwards. No definition available.
|
| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to temporary differences. No definition available.
|
| 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.
|
| 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
|
| X | ||||||||||
- References No definition available.
|
| 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
|
| 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
|
| 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
|
| 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
|
| 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
|