Annual report pursuant to Section 13 and 15(d)

Note 15 - Income Taxes - Components of Deferred Tax Assets (Details)

v3.21.1
Note 15 - Income Taxes - Components of Deferred Tax Assets (Details) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating loss carryforwards $ 34,365,098 $ 31,966,658
R&D credit carryforwards 9,301,709 9,150,580
AMT credit carryforward 310,620
Stock compensation 419,654 382,016
Intangibles 616,926 610,783
Disallowed interest expense 852,338 857,648
Temporary differences 267,312 333,728
Deferred tax assets before valuation allowance 45,823,037 43,612,033
Valuation allowance (45,823,037) (43,301,413)
Net deferred tax assets $ 310,620