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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities    
Net loss $ (606,040) $ (566,615)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 1,760,220 1,683,676
Interest from amortization of debt costs 9,286 11,962
(Gain) loss on disposal of property and equipment (129,224) 43,257
Stock-based compensation on stock options & RSU, net 178,389 197,815
Provision for doubtful accounts receivable 9,147 1,469
Change in operating lease liabilities (64,090) (27,096)
Inventory write-offs to reserve 0 2,114
Deferred tax benefit 0 (406,000)
Changes in operating assets and liabilities:    
Trade accounts receivables (1,199,691) (849,007)
Other receivables 353,695 (22,858)
Inventories 142,198 (594,141)
Prepaid expenses and other assets 338,034 214,960
Accounts payable and accrued liabilities 146,547 (87,707)
Net cash provided by (used in) operating activities 938,471 (398,171)
Cash flows from investing activities    
Purchase of property and equipment (1,153,227) (1,180,184)
Proceeds from sale of equipment 179,573 110,500
Net cash used in investing activities (973,654) (1,069,684)
Cash flows from financing activities    
Proceeds from exercise of stock options 0 4,261
Proceeds from sale of common stock from employee stock purchase plan 12,167 20,841
Payments on loan payable (290,675) (729,399)
Repayment of finance lease obligations (210,225) 0
Payments on capital lease obligations 0 (167,626)
Net cash used in financing activities (488,733) (871,923)
Effect of exchange rate on cash and cash equivalents 196,822 472,547
Change in cash and cash equivalents and restricted cash (327,094) (1,867,231)
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 4,277,607 4,641,389
Supplemental disclosure of cash flow information:    
Interest paid in cash 182,241 267,065
Income taxes paid 249,777 247,664
Supplemental disclosure of non-cash investing & financing activities:    
Purchase of equipment through capital lease arrangements $ 0 $ 411,750