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Note 3. Stock-based Compensation (Details) - USD ($)
3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Details    
Allocated Share-based Compensation Expense $ 71,786 $ 64,232
Common Stock, Capital Shares Reserved for Future Issuance 287,167  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 233,300  
Employee Service Share Based Compensation Unrecognized Compensation Costs On Nonvested Awards Weighted Average Period Of Recognition 4.52 years  
Aggregate intrinsic value of options outstanding $ 435