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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities    
Net loss $ (1,375,157) $ (582,891)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 892,072 862,146
Interest from amortization of debt costs 4,643 5,981
(Gain) loss on disposal of property and equipment (50,000) 58,757
Stock-based compensation on stock options & RSU, net 98,459 93,910
Provision for doubtful accounts receivable 0 (828)
Change in operating lease liabilities (24,844) (22,828)
Deferred tax benefit 0 (298,000)
Changes in operating assets and liabilities:    
Trade accounts receivables 682,975 130,855
Other receivables 353,695 15,617
Inventories (332,161) (116,989)
Prepaid expenses and other assets 190,940 (111,059)
Accounts payable and accrued liabilities 9,443 (333,650)
Net cash provided by (used in) operating activities 450,065 (298,979)
Cash flows from investing activities    
Purchase of property and equipment (256,573) (670,079)
Proceeds from sale of equipment 50,000 95,000
Net cash used in investing activities (206,573) (575,079)
Cash flows from financing activities    
Proceeds from sale of common stock from employee stock purchase plan 12,167 20,841
Payments on loan payable (145,338) (364,699)
Repayment of finance lease obligations (103,618) 0
Payments on capital lease obligations 0 (99,901)
Net cash used in financing activities (236,789) (443,759)
Effect of exchange rate on cash and cash equivalents 53,766 341,293
Change in cash and cash equivalents and restricted cash 60,469 (976,524)
Cash and cash equivalents and restricted cash, beginning of period 4,604,701 6,508,620
Cash and cash equivalents and restricted cash, end of period 4,665,170 5,532,096
Supplemental disclosure of cash flow information:    
Interest paid in cash 95,870 138,913
Income taxes paid $ 57,660 $ 127,945