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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash flows from operating activities:    
Net (loss) income $ (632,097) $ 97,068
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 910,962 826,308
Interest from amortization of debt costs 4,600 4,643
Gain on disposal of property and equipment 0 (45)
Stock-based compensation on stock options & RSUs, net 116,591 136,849
Provision for doubtful accounts receivable 12,010 0
Change in operating lease liabilities (52,172) (45,158)
Inventory write-offs to allowance 60,935 112,282
Changes in operating assets and liabilities:    
Trade accounts receivable (1,283,594) (70,201)
Other receivables 134,860 132,051
Inventories (109,829) (775,234)
Prepaid expenses and other assets 19,702 147,148
Accounts payable and accrued liabilities (799,693) 96,727
Net cash (used in) provided by operating activities (1,617,682) 662,438
Cash flows from investing activities:    
Purchase of property and equipment (1,199,005) (1,216,817)
Net cash used in investing activities (1,199,005) (1,216,817)
Cash flows from financing activities:    
Proceeds from exercise of stock options 0 126,100
Proceeds from sale of common stock from Employee Stock Purchase Plan 21,726 11,009
Borrowings on loans payable 266,850  
Payments on loans payable (163,758) (245,338)
Repayment of finance lease obligations (73,891) (67,501)
Net cash provided by (used in) financing activities 50,927 (175,730)
Effect of exchange rate on cash and cash equivalents (31,953) 729,308
Change in cash and cash equivalents (2,797,713) (801)
Cash and cash equivalents, beginning of period 6,774,694 5,387,388
Cash and cash equivalents, end of period 3,976,981 5,386,587
Supplemental disclosure of cash flow information:    
Interest paid in cash 41,466 54,089
Income taxes paid $ 111,535 $ 241,293