Annual report pursuant to Section 13 and 15(d)

Note 15 - Income Taxes (Details Textual)

v3.21.1
Note 15 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2020
Deferred Tax Assets, Gross, Total $ 45,823,037 $ 43,612,033    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00%    
Revaluation of Deferred Tax Asset, Decrease     $ 26,400,000  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount     $ 26,400,000  
Tax Credit Carryforwards, Alternative Minimum Tax, Percentage Included in Prepaid and Other Current Assets   50.00%    
Tax Credit Carryforwards, Alternative Minimum Tax, Percentage Included in Other Noncurrent Assets   50.00%    
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]        
Operating Loss Carryforwards, Total $ 153,345,670 $ 142,200,000    
Operating Loss Carryforwards Stock-based Compensation 15,000,000      
State and Local Jurisdiction [Member]        
Operating Loss Carryforwards, Total 20,100,000 20,100,000    
Alternative Minimum Tax [Member]        
Tax Credit Carryforward, Amount   621,000    
Alternative Minimum Tax [Member] | Prepaid Expenses and Other Current Assets [Member]        
Tax Credit Carryforward, Amount 0     $ 621,000
Research Tax Credit Carryforward [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]        
Tax Credit Carryforward, Amount 8,912,821 8,800,000    
Tax Credit Carryforward, Amount Expired During Period $ 72,000 $ 130,000