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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
 6 Months Ended
Nov. 30, 2020
Nov. 30, 2019
Cash flows from operating activities:    
Net loss $ (3,134,579) $ (991,556)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 64,435 65,545
Change in allowance on accounts receivable 410,161 3,571
Inventory reserve 11,943 6,873
Stock option expense 24,227 34,978
Reduction in deferred rent liability (37,971)
Amortization of right-of-use asset 115,025 157,356
Changes in assets and liabilities:    
Accounts receivable (256,059) 168,133
Inventories (1,359,320) (46,675)
Prepaid expenses 1,055,946 18,431
Reduction in lease liability (102,677) (102,133)
Other assets (94,085)
Accounts payable and accrued expenses 271,386 345,211
Accrued compensation 113,379 12,243
Net cash used in operating activities (2,880,218) (365,994)
Cash flows from investing activities:    
Increase in intangibles (61,536) (15,008)
Purchases of property and equipment (61,566) (6,323)
Net cash used in investing activities (123,102) (21,331)
Cash flows from financing activities:    
Proceeds from sale of common stock, net 307,686
Proceeds from exercise of stock options 49,330 48,928
Proceeds from equity financing-officer 200,000
Net cash provided by financing activities 49,330 556,614
Effect of exchange rate changes in cash (3,250) (5,085)
Net (decrease) increase in cash and cash equivalents (2,957,240) 164,204
Cash and cash equivalents at beginning of period 8,641,027 686,785
Cash and cash equivalents at end of period 5,683,787 850,989
Cash paid during the period for:    
Interest 5
Income taxes 11,735 7,844
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