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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
 6 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Cash Flows from Operating Activities:    
Net loss $ (89,111) $ (605,503)
Adjustments to reconcile net loss to net cash provided from (used in) operating activities    
Depreciation and amortization 15,804 16,019
Gain on sale of assets 0 (1,515)
Stock-based compensation expense 33,028 110,433
Non-cash consulting expense (3,387) 17,400
Changes in operating assets and liabilities    
Accounts receivable, net (284,604) 308,293
Inventories, net 67,656 35,560
Prepaid expenses (22,447) (5,915)
Accounts payable 41,586 (168,433)
Customer advances 283,152 37,100
Accrued liabilities 26,318 (22,880)
Net cash provided from (used in) operating activities 67,995 (279,441)
Cash Flows from Investing Activities:    
Additional patent costs (17,189) (5,848)
Purchases of property and equipment 0 (25,843)
Proceeds from sale of assets 0 1,515
Net cash used in investing activities (17,189) (30,176)
Cash Flows from Financing Activities:    
Payment of capital lease obligation (4,127) (3,864)
Gross proceeds from private placement of common stock 210,001 780,000
Gross proceeds from exercise of stock purchase warrrants 6,667 0
Net cash provided from financing activities 212,541 776,136
Net increase in cash and cash equivalents 263,347 466,519
Cash and cash equivalents, beginning of period 118,405 50,059
Cash and cash equivalents, end of period 381,752 516,578
Supplemental disclosure of non-cash financing and investing activities:    
Issuance of common stock in settlement of accounts payable 40,000 0
Offering costs included in accounts payable $ 2,963 $ 0