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Note 9 - Notes Payable (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Sep. 30, 2019
Mar. 31, 2020
Apr. 01, 2023
Apr. 02, 2022
Dec. 31, 2022
Property, Plant and Equipment, Gross, Ending Balance     $ 12,838,876   $ 12,708,959
Interest Expense, Debt     $ 1,538 $ 2,269  
Massachusetts Business Development Corporation [Member] | Revolving Credit Facility [Member]          
Debt Instrument, Termination Period (Year) 3 years        
Microscope Note Payable [Member]          
Debt Instrument, Term (Year)   5 years      
Debt Instrument, Periodic Payment, Total   $ 4,000      
Debt Instrument, Interest Rate, Stated Percentage   6.47%      
Sonoscan Ultrasound Microscope [Member]          
Property, Plant and Equipment, Gross, Ending Balance   $ 208,000