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Condensed Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash Flows From Operating Activities    
Net income $ 121,120 $ 191,172
Adjustments to reconcile net income to net cash provided (used) by operating activities:    
Depreciation 164,070 155,781
Amortization of finite-life intangible assets 28,258 30,674
Amortization of debt issuance costs 2,197 4,344
Share-based compensation expense 190,385 109,208
Deferred income taxes (7,000)  
Changes in operating assets and liabilities:    
Accounts receivable 305,627 (432,128)
Inventories 115,588 (100,596)
Prepaid expenses and other assets (172,097) (12,500)
Income tax receivable (226,582) 58,289
Income tax payable (156,524)  
Accounts payable and accrued liabilities (36,915) (1,220,113)
Net cash provided (used) by operating activities 328,127 (1,215,869)
Cash Flows From Investing Activities    
Expenditures for property and equipment (95,011) (49,462)
Expenditures for finite-life intangible assets (7,436) (21,494)
Net cash used in investing activities (102,447) (70,956)
Cash Flows From Financing Activities    
Principal payments on long-term debt including capital lease obligations (12,397) (12,518)
Net increase (decrease) in cash 213,283 (1,299,343)
Cash    
Beginning of period 5,573,709 5,123,355
End of period $ 5,786,992 $ 3,824,012