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Note 4 - Revenue Recognition 2 (Details Textual)
Mar. 31, 2020
USD ($)
Revenue, Remaining Performance Obligation, Amount $ 4,165,838
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01  
Revenue, Remaining Performance Obligation, Amount $ 3,729,958
Revenue, Remaining Performance Obligation, Percentage 90.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month) 1 year