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Note 11 - Commitments and Contingencies (Details Textual)
3 Months Ended
Oct. 17, 2018
USD ($)
Feb. 15, 2018
USD ($)
Sep. 06, 2016
USD ($)
Jun. 22, 2016
USD ($)
Sep. 15, 2015
USD ($)
Sep. 30, 2018
USD ($)
Offices in New Jersey [Member]            
Lessee, Operating Lease, Term of Contract         6 years  
Offices in New Jersey [Member] | Letter of Credit [Member]            
Repayments of Debt         $ 121,000  
Offices in New Jersey [Member] | Minimum [Member]            
Operating Leases, Yearly Rent Expense         135,000  
Offices in New Jersey [Member] | Maximum [Member]            
Operating Leases, Yearly Rent Expense         $ 148,000  
Alleged Amount Owed to AT&T [Member]            
Loss Contingency, Damages Sought, Value           $ 500,000
Severance Compensation Arbitration Filed by Former CEO [Member]            
Loss Contingency, Damages Sought, Value       $ 341,620    
Cogmedix, Inc. v. Authentidate Holding Corp [Member]            
Loss Contingency, Damages Sought, Value     $ 227,061      
Litigation Settlement, Amount Awarded to Other Party   $ 320,638        
Cogmedix, Inc. v. Authentidate Holding Corp [Member] | Subsequent Event [Member]            
Litigation Settlement, Amount Awarded to Other Party, Number of Monthly Installments 9          
Litigation Settlement, Amount Awarded to Other Party, Monthly Installments $ 149,996