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Note 4 - Revenue Recognition 2 (Details Textual)
Jun. 30, 2019
USD ($)
Revenue, Remaining Performance Obligation, Amount $ 2,009,225
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-07-01  
Revenue, Remaining Performance Obligation, Amount $ 1,408,469
Revenue, Remaining Performance Obligation, Percentage 70.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 1 year