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Consolidated Statements of Cash Flows - USD ($)
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 5,918,587 $ (1,473,758)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation 92,736 92,961
Amortization of intangible assets 482,792 422,183
Disposal of intangible assets 38,498 0
Reserve for obsolete inventory 0 257,779
Deferred tax (benefit) 1,344,787 (429,546)
Amortization of right of use assets 361,533 0
Increase (decrease) in cash due to change in:    
Accounts receivable (11,855,351) 3,852,985
Inventories (10,730,663) 304,813
Prepaid expenses and other current assets 6,454 (9,008)
Prepaid income taxes 0 28,240
Advance payments to vendors 23,502 27,356
Other assets (25,272) (118,460)
Accounts payable 36,410,741 (1,937,071)
Income tax payable 34,059 (3,096)
Advance payments from customers 0 (228,598)
Lease liabilities (316,462) 0
Accrued liabilities 218,363 (11,690)
Net cash provided by operating activities 22,004,304 775,090
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of short-term investments (1,692) (5,380,226)
Purchases of shares of a subsidiary (75,000) (234,330)
Purchases of property and equipment (181,746) (100,768)
Payments for capitalized development costs (343,360) (465,352)
Purchases of intangible assets (193,171) (70,034)
Net cash used in investing activities (794,969) (6,250,710)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds of payroll protection plan loan 487,300 0
Cash received from exercise of stock options 33,128 0
Net cash provided by financing activities 520,428 0
Effect of foreign currency translation (15,624) (52,819)
Net increase (decrease) in cash and cash equivalents 21,714,139 (5,528,439)
Cash and cash equivalents, beginning of year 6,447,505 11,975,944
Cash and cash equivalents, end of year 28,161,644 6,447,505
Supplemental disclosure of cash flow information:    
Cash paid during the periods for: Income taxes (800) (801)
Non-cash investing and financing activities:    
Initial adoption of right of use assets 1,501,203 0
Initial adoption of lease liabilities $ 1,501,203 $ 0