Annual report pursuant to Section 13 and 15(d)

Note 16 - Income Taxes (Details Textual)

v3.20.1
Note 16 - Income Taxes (Details Textual) - USD ($)
 12 Months Ended
Dec. 22, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred Tax Assets, Gross, Total   $ 43,612,033 $ 41,572,772  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00% 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% 50.00%  
Tax Credit Carryforwards, Alternative Minimum Tax, Percentage Included in Other Noncurrent Assets   50.00% 50.00%  
Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]        
Operating Loss Carryforwards, Total   $ 142,183,037 $ 130,900,000  
Operating Loss Carryforwards Stock-based Compensation   15,100,000    
Net Operating Loss Carryforwards Expired in Period   0 0  
State and Local Jurisdiction [Member]        
Operating Loss Carryforwards, Total   20,100,000 20,300,000  
Alternative Minimum Tax [Member]        
Tax Credit Carryforward, Amount   621,000 1,200,000  
Research Tax Credit Carryforward [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]        
Tax Credit Carryforward, Amount   8,761,692 8,700,000  
Tax Credit Carryforward, Amount Expired During Period   $ 130,000 $ 1,200,000 $ 28