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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) | 12 Months Ended
--- | ---
May 31, 2020 | May 31, 2019
CASH FLOWS FROM OPERATING ACTIVITIES: |  |
Net loss | $ (2,339,054) | $ (2,393,060)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 129,172 | 162,905
Change in provision for allowance for doubtful accounts | (2,129) | 15,415
Inventory reserve | 17,714 | 6,300
Stock option expense | 200,470 | 151,224
Reduction (increase) in deferred rent liability | (37,971) | 6,615
Decrease in deferred tax asset |  | 10,000
Amortization of right-of-use asset | 269,460 |
Changes in assets and liabilities: |  |
Accounts receivable | (309,090) | (670,126)
Inventories | (717,460) | 21,387
Prepaid expenses and other | (1,306,681) | 98,007
Reduction in lease liability | (199,483) |
Other assets | (41,361) | (13,677)
Accounts payable and accrued expenses | (12,883) | 343,994
Accrued compensation | 51,798 | 16,977
Net cash used in operating activities | (4,297,498) | (2,244,039)
CASH FLOWS FROM INVESTING ACTIVITIES: |  |
Increase in intangibles | (85,319) | (69,974)
Purchases of property and equipment | (33,608) | (101,137)
Net cash used in investing activities | (118,927) | (171,111)
CASH FLOWS FROM FINANCING ACTIVITIES: |  |
Common stock subscribed |  | 9,062
Proceeds from sale of convertible preferred stock, net | 1,917,586 |
Proceeds from sales of common stock, net | 10,232,857 | 1,776,575
Proceeds from exercise of stock options | 223,534 | 121,790
Net cash provided by financing activities | 12,373,977 | 1,907,427
Effect of exchange rate changes on cash | (3,310) | (10,395)
Net increase (decrease) in cash and cash equivalents | 7,954,242 | (518,118)
CASH AND CASH EQUIVALENTS, beginning of year | 686,785 | 1,204,903
CASH AND CASH EQUIVALENTS, end of year | 8,641,027 | 686,785
Cash paid during the year for: |  |
Interest | 9 | 47
Income taxes | 7,390 | 14,237
Non-cash Investing and Financing Activities: |  |
Establishment of Right-of-use asset per ASC 842 | 1,942,999 |
Establishment of Lease liability per ASC 842 | $ 1,980,970 |

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