Annual report pursuant to Section 13 and 15(d)

Note 17 - Income Taxes - Components of Deferred Tax Assets (Details)

v3.19.1
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