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Note 1 - Summary of Significant Accounting Policies - Recurring Fair Value Measurements (Details) - Fair Value, Recurring [Member]
Mar. 31, 2020
USD ($)
Contingent Earn-out Liability $ 880,308
Fair Value, Inputs, Level 1 [Member]  
Contingent Earn-out Liability
Fair Value, Inputs, Level 2 [Member]  
Contingent Earn-out Liability
Fair Value, Inputs, Level 3 [Member]  
Contingent Earn-out Liability $ 880,308