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Note 3 - Revenue From Contracts With Customers (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Percentage of Support and Maintenance Revenue to License Cost 18.00%    
Capitalized Contract Cost, Amortization Period (Year) 4 years    
Contract with Customer, Liability, Revenue Recognized $ 72,000 $ 0  
Contract with Customer, Liability, Total $ 413,345   $ 359,212