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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities    
Net (loss) income $ 866,929 $ (2,680,323)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation and amortization 3,424,438 3,464,156
Interest from amortization of debt costs 18,572 117,261
Gain on disposal of property and equipment (107,280) (77,047)
Stock-based compensation on stock options & RSUs, net 250,737 394,790
Provision for doubtful accounts receivable 18,826 (6,658)
Change in operating lease liabilities (157,757) 370,701
Inventory write-offs to allowance 127,872 125,234
Deferred tax benefit (7,000) (28,000)
Changes in operating assets and liabilities:    
Trade accounts receivables 3,279 (833,665)
Other receivables 221,644 (306,348)
Inventories (1,427,827) (1,405,020)
Prepaid expenses and other assets 403,220 392,925
Accounts payable and accrued liabilities 97,160 883,179
Net cash provided by operating activities 3,732,813 411,185
Cash flows from investing activities    
Purchase of property and equipment (2,442,779) (1,931,835)
Proceeds from sale of equipment 186,986 683,250
Net cash used in investing activities (2,255,793) (1,248,585)
Cash flows from financing activities    
Proceeds from exercise of stock options 22,263 13,767
Proceeds from sale of common stock from employee stock purchase plan 24,612 38,438
Loan costs 0 (92,860)
Borrowings on loan payable 400,000 5,813,500
Payments on loan payable (581,350) (6,831,503)
Repayment of finance lease obligations (487,233) 0
Payments on capital lease obligations 0 (342,871)
Net cash used in financing activities (621,708) (1,401,529)
Effect of exchange rate on cash and cash equivalents (72,625) 335,010
Change in cash and cash equivalents and restricted cash 782,687 (1,903,919)
Cash and cash equivalents and restricted cash, beginning of period 4,604,701 6,508,620
Cash and cash equivalents, end of period 5,387,388 4,604,701
Supplemental disclosure of cash flow information:    
Interest paid in cash 330,910 500,985
Income taxes paid 526,225 406,526
Supplemental disclosure of non-cash investing & financing activities:    
Purchase of equipment through capital lease arrangements 0 530,253
Landlord credits for leasehold improvements $ 0 $ 309,450