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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
6 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Cash flows from operating activities:    
Net loss $ (928,984) $ (475,720)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation and amortization 89,013 94,133
Stock option expense 9,126 4,624
Change in provision for allowance for doubtful accounts 13,192 7,514
Inventory reserve 36,467 (343)
Increase in deferred rent liability 4,351 13,000
Changes in assets and liabilities:    
Accounts receivable (473,799) (2,545)
Inventories 27,269 (97,204)
Prepaid expenses and other 106,706 (169,336)
Accounts payable and accrued expenses 109,163 245,393
Accrued compensation 6,428 17,134
Net cash used in operating activities (1,001,068) (363,350)
Cash flows from investing activities:    
Purchases of property and equipment (53,080) (52,923)
Increase in intangible assets (31,937)
Net cash used in investing activities (85,017) (52,923)
Cash flows from financing activities:    
Proceeds from exercise of stock options 75,200 13,789
Proceeds from sale of common stock, net 936,702
Net cash provided by financing activities 1,011,902 13,789
Effect of exchange rate changes on cash (5,806) (5,168)
Net decrease in cash and cash equivalents (79,989) (407,652)
Cash and cash equivalents at beginning of period 1,204,903 1,225,462
Cash and cash equivalents at end of period 1,124,914 817,810
Cash paid during the period for:    
Interest 47 37
Income taxes $ 0 $ 0