Quarterly report pursuant to Section 13 or 15(d)

Note 13 - Income Taxes (Details Textual)

v3.20.2
Note 13 - Income Taxes (Details Textual) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
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%
Unrecognized Tax Benefits, Ending Balance $ 0  
Domestic Tax Authority [Member]    
Operating Loss Carryforwards, Total 142,200,000  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards, Total 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 621,000  
Research Tax Credit Carryforward [Member] | Domestic Tax Authority [Member] | Internal Revenue Service (IRS) [Member]    
Tax Credit Carryforward, Amount $ 8,800,000