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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) | 6 Months Ended
--- | ---
Nov. 30, 2021 | Nov. 30, 2020
Cash flows from operating activities: |  |
Net loss | $ (2,667,855) | $ (3,610,492)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |
Depreciation and amortization | 68,668 | 64,435
Change in allowance on accounts receivable | (809,638) | 410,161
Inventory reserve | 181,825 | 11,943
Stock option expense | 634,019 | 500,140
Amortization of right-of-use asset | 126,039 | 115,025
Changes in assets and liabilities: |  |
Accounts receivable | 1,139,450 | (256,059)
Inventories | 42,229 | (1,359,320)
Prepaid expenses and other | (726,460) | 1,055,946
Reduction in lease liability | (117,321) | (102,677)
Other assets | 114,570 | (94,085)
Accounts payable and accrued expenses | 997,327 | 271,386
Accrued compensation | 285,431 | 113,379
Advance from customers | 2,150,466 |
Net cash provided by (used in) operating activities | 1,418,750 | (2,880,218)
Cash flows from investing activities: |  |
Increase in intangibles | (108,917) | (61,536)
Purchases of property and equipment | (18,212) | (61,566)
Net cash used in investing activities | (127,129) | (123,102)
Cash flows from financing activities: |  |
Proceeds from sale of common stock, net | 1,684,123 |
Proceeds from exercise of stock options | 34,480 | 49,330
Net cash provided by financing activities | 1,718,603 | 49,330
Effect of exchange rate changes in cash | (10,363) | (3,250)
Net increase (decrease) in cash and cash equivalents | 2,999,861 | (2,957,240)
Cash and cash equivalents at beginning of period | 4,199,311 | 8,641,027
Cash and cash equivalents at end of period | 7,199,172 | 5,683,787
Cash paid during the period for: |  |
Income taxes | $ 10,646 | $ 11,735

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