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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities    
Net income (loss) $ (49,477) $ (606,040)
Adjustments to reconcile net income (loss) to cash provided by operating activities    
Depreciation and amortization 1,691,163 1,760,220
Interest from amortization of debt costs 9,286 9,286
Gain on disposal of property and equipment (522) (129,224)
Stock-based compensation on stock options & RSU, net 243,016 178,389
Provision for doubtful accounts receivable 0 9,147
Change in operating lease liabilities (86,804) (64,090)
Inventory write-offs to allowance 133,204 0
Changes in operating assets and liabilities:    
Trade accounts receivables (654,092) (1,199,691)
Other receivables 132,051 353,695
Inventories (841,999) 142,198
Prepaid expenses and other assets 266,797 338,034
Accounts payable and accrued liabilities 699,412 146,547
Net cash provided by operating activities 1,542,035 938,471
Cash flows from investing activities    
Purchase of property and equipment (2,160,710) (1,153,227)
Proceeds from sale of equipment 0 179,573
Net cash used in investing activities (2,160,710) (973,654)
Cash flows from financing activities    
Proceeds from exercise of stock options 128,834 0
Proceeds from sale of common stock from Employee Stock Purchase Plan 11,009 12,167
Borrowings on loan payable 275,377 0
Payments on loan payable (395,257) (290,675)
Repayment of finance lease obligations (136,332) (210,225)
Net cash used in financing activities (116,369) (488,733)
Effect of exchange rate on cash and cash equivalents 653,899 196,822
Change in cash and cash equivalents and restricted cash (81,145) (327,094)
Cash and cash equivalents and restricted cash, beginning of period 5,387,388 4,604,701
Cash and cash equivalents and restricted cash, end of period 5,306,243 4,277,607
Supplemental disclosure of cash flow information:    
Interest paid in cash 105,029 182,241
Income taxes paid $ 512,499 $ 249,777