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Note 3 - Revenue From Contracts With Customers (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 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 $ 94,000 $ 89,000 $ 202,000 $ 200,000  
Contract with Customer, Liability, Total $ 813,505   $ 813,505   $ 359,212