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Note 5 - Short-term Contract Obligation (Details Textual)
Nov. 30, 2018
USD ($)
a
Dec. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2020
USD ($)
Short-term Obligation for Cellana Asset Purchase [Member]        
Debt Instrument, Face Amount $ 180,000      
Debt Instrument, Interest Rate, Stated Percentage 6.25%      
Debt Instrument, Periodic Payment, Number of Monthly Payments 4      
Short-term Non-bank Loans and Notes Payable   $ 0 $ 0  
Short-term Obligation for Cellana Asset Purchase 2 [Member]        
Debt Instrument, Face Amount $ 215,000      
Debt Instrument, Periodic Payment, Number of Monthly Payments 12      
Debt Instrument, Hold-back, Amount       $ 38,000
Cellana Asset Purchase [Member]        
Noncash or Part Noncash Acquisition, Value of Assets Acquired, Total $ 495,000      
Payments to Acquire Buildings 100,000      
Issuance of Short Term Obligations $ 395,000      
Research Facility Owned by Cellana [Member]        
Area of Real Estate Property (Acre) | a 6