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Note 8 - Secured Promissory Note Payable to Oxford Finance (Details Textual) - Loan Agreement [Member] - Oxford Finance [Member] - USD ($)
3 Months Ended 9 Months Ended
Dec. 22, 2016
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Long-term Debt, Gross $ 5,000,000        
Debt Instrument, Term (Year) 4 years        
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid $ 325,000        
Debt Instrument, Interest Rate, Effective Percentage 10.50%        
Interest Paid, Including Capitalized Interest, Operating and Investing Activities, Total   $ 82,000 $ 55,000 $ 284,000 $ 191,000
London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate 6.17%