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Note 2 - Significant Accounting Policies (Details Textual)
12 Months Ended
Mar. 01, 2022
USD ($)
ft²
Jul. 21, 2018
USD ($)
ft²
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
$ / shares
Jul. 01, 2019
USD ($)
Product Warranty Expense     $ 0    
Operating Lease, Liability, Current     53,862 $ 90,156  
Operating Lease, Liability, Noncurrent     321,818 605,214  
Operating Lease, Right-of-Use Asset     368,512 695,371  
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total     649,433 1,248,936  
Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent, Total     108,052 408,925  
Advertising Expense     $ 22,673 $ 5,000  
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares     $ 0.01 $ 0.01  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) | shares     1,085,068    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | shares     23,737    
Minimum [Member]          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares     $ 4.00    
Maximum [Member]          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares     $ 10.00    
Located at 5258 South Commerce Drive [Member]          
Lessee, Operating Lease, Term of Contract (Year)   3 years      
Lessee, Operating Lease, Renewal Term (Year) 3 years 3 years      
Area of Real Estate Property (Square Foot) | ft² 5,000 9,800      
Operating Leases, Monthly Rent Expense $ 5,871 $ 10,200      
Percentage of Monthly Rent Increase Each Year 3.00%        
Cumulative Effect, Period of Adoption, Adjustment [Member]          
Operating Lease, Liability, Current         $ 82,517
Operating Lease, Liability, Noncurrent         760,172
Operating Lease, Right-of-Use Asset         $ 842,689
Lessee, Operating Lease, Term of Contract (Year)         3 years
Lessee, Operating Lease, Renewal Term (Year)         3 years
Accounts Receivable [Member]          
Number of Major Customers     2    
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer A & B [Member]          
Concentration Risk, Percentage     10.00%    
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer A [Member]          
Accounts Receivable, after Allowance for Credit Loss, Total     $ 962,300 $ 967,300  
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer B [Member]          
Accounts Receivable, after Allowance for Credit Loss, Total     $ 340,155 $ 404,155