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Note 4 - Revenue Recognition 2 (Details Textual)
Jun. 30, 2020
USD ($)
Revenue, Remaining Performance Obligation, Amount $ 6,681,891
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01  
Revenue, Remaining Performance Obligation, Amount $ 6,298,478
Revenue, Remaining Performance Obligation, Percentage 94.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month) 1 year