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Common Stock and Common Stock Equivalents (Tables)
 12 Months Ended
Jun. 30, 2023
Common Stock and Common Stock Equivalents  
Schedule of share based compensation activity [Table Text Block]
    2023           2022  
    Number
of
shares		     Weighted average
exercise price		     Weighted
average
remaining
contractual
term		     Number
of
shares		     Weighted average
exercise price		  
Options outstanding at beginning of the year   28,000   $       7.80     4.75 years     28,000   $       7.80  
Options granted   -           n/a           -           n/a  
Options canceled or expired   -           n/a           -           n/a  
                                           
Options outstanding at end of the year   28,000   $       7.80     3.75 years     28,000   $       7.80  
                                           
Options exercisable at end of the year   22,250   $       8.26           15,500   $       9.00  
                                           
Range of exercise prices at end of the year       $ 4.65    -  13.50               $ 4.65   -   13.50