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Note 3 - Revenue From Contracts With Customers (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Percentage of Support and Maintenance Revenue to License Cost   18.00%    
Capitalized Contract Cost, Amortization Period (Year) 4 years 4 years    
Contract with Customer, Liability, Revenue Recognized $ 36,000 $ 108,000 $ 0  
Contract with Customer, Liability, Total $ 602,779 $ 602,779   $ 359,212