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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash flows from operating activities    
Net income (loss) $ 97,068 $ (1,375,157)
Adjustments to reconcile net income (loss) to cash provided by operating activities    
Depreciation and amortization 826,308 892,072
Interest from amortization of debt costs 4,643 4,643
Gain on disposal of property and equipment (45) (50,000)
Stock-based compensation on stock options & RSU, net 136,849 98,459
Change in operating lease liabilities (45,158) (24,844)
Inventory write-offs to allowance 112,282 0
Changes in operating assets and liabilities:    
Trade accounts receivables (70,201) 682,975
Other receivables 132,051 353,695
Inventories (775,234) (332,161)
Prepaid expenses and other assets 147,148 190,940
Accounts payable and accrued liabilities 96,727 9,443
Net cash provided by operating activities 662,438 450,065
Cash flows from investing activities    
Purchase of property and equipment (1,216,817) (256,573)
Proceeds from sale of equipment 0 50,000
Net cash used in investing activities (1,216,817) (206,573)
Cash flows from financing activities    
Proceeds from exercise of stock options 126,100 0
Proceeds from sale of common stock from Employee Stock Purchase Plan 11,009 12,167
Payments on loan payable (245,338) (145,338)
Repayment of finance lease obligations (67,501) (103,618)
Net cash used in financing activities (175,730) (236,789)
Effect of exchange rate on cash and cash equivalents 729,308 53,766
Change in cash and cash equivalents and restricted cash (801) 60,469
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 5,386,587 4,665,170
Supplemental disclosure of cash flow information:    
Interest paid in cash 54,089 95,870
Income taxes paid $ 241,293 $ 57,660