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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Cash flows from operating activities    
Net (loss) income $ (272,041) $ 209,977
Adjustments to reconcile net (loss) income to cash provided by operating activities    
Depreciation and amortization 2,608,472 2,587,315
Interest from amortization of debt costs 13,929 13,929
Loss (gain) on disposal of property and equipment 8,951 (129,082)
Stock-based compensation on stock options & RSU, net 443,077 252,436
Provision for doubtful accounts receivable (1,632) 9,769
Change in operating lease liabilities (135,746) (107,747)
Inventory write-offs to allowance 144,741 37,883
Changes in operating assets and liabilities:    
Trade accounts receivables 31,649 (108,222)
Other receivables (186,769) 353,695
Inventories (43,542) (590,415)
Prepaid expenses and other assets 125,237 198,058
Accounts payable and accrued liabilities 339,909 (857,813)
Net cash provided by operating activities 3,076,235 1,869,783
Cash flows from investing activities    
Purchase of property and equipment (2,721,567) (1,505,021)
Proceeds from sale of equipment 0 186,986
Net cash used in investing activities (2,721,567) (1,318,035)
Cash flows from financing activities    
Proceeds from exercise of stock options 142,693 0
Proceeds from sale of common stock from Employee Stock Purchase Plan 29,976 24,612
Borrowings on loan payable 275,377 0
Payments on loan payable (554,102) (436,013)
Repayment of finance lease obligations (206,644) (315,638)
Net cash used in financing activities (312,700) (727,039)
Effect of exchange rate on cash and cash equivalents 511,343 (47,697)
Change in cash and cash equivalents and restricted cash 553,311 (222,988)
Cash and cash equivalents, beginning of period 5,387,388 4,604,701
Cash and cash equivalents, end of period 5,940,699 4,381,713
Supplemental disclosure of cash flow information:    
Interest paid in cash 151,537 262,607
Income taxes paid $ 787,289 $ 441,982