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Note 5 - Short-term Contract Obligations (Details Textual)
Nov. 30, 2018
USD ($)
a
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Short-term Non-bank Loans and Notes Payable   $ 101,000 $ 285,000
Short-term Obligation for Cellana Asset Purchase [Member]      
Debt Instrument, Face Amount $ 180,000    
Debt Instrument, Interest Rate, Stated Percentage 6.25%    
Short-term Non-bank Loans and Notes Payable   0  
Short-term Obligation for Cellana Asset Purchase 2 [Member]      
Debt Instrument, Face Amount $ 215,000    
Short-term Non-bank Loans and Notes Payable   $ 101,000  
Debt Instrument, Hold-back, Amount 38,000    
Short-term Obligation for Cellana Asset Purchase 2 [Member] | Redeemed in Two Monthly Payments [Member]      
Debt Instrument, Periodic Payment, Total 10,000    
Short-term Obligation for Cellana Asset Purchase 2 [Member] | Redeemed in Ten Monthly Payments [Member]      
Debt Instrument, Periodic Payment, Total 19,543    
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 | a 6