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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
May 31, 2019
May 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (2,393,060) $ (1,465,828)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 162,905 186,601
Change in provision for allowance for doubtful accounts 15,415 7,566
Inventory reserve 6,300 7,613
Stock option expense 151,224 18,473
Decrease in deferred rent liability 6,615 15,787
Decrease in deferred tax asset 10,000 31,000
Changes in assets and liabilities:    
Accounts receivable (670,126) 252,505
Inventories 21,387 (457,269)
Prepaid expenses and other 98,007 (104,652)
Other assets (13,677) (18,168)
Accounts payable and accrued expenses 343,994 319,169
Accrued compensation 16,977 32,986
Net cash used in operating activities (2,244,039) (1,174,217)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Increase in intangibles (69,974)
Purchases of property and equipment (101,137) (130,347)
Net cash used in investing activities (171,111) (130,347)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Common stock subscribed 9,062
Proceeds from sale of common stock, net 1,776,575 1,266,871
Proceeds from exercise of stock options 121,790 27,436
Net cash provided by financing activities 1,907,427 1,294,307
Effect of exchange rate changes on cash (10,395) (10,302)
Net decrease in cash and cash equivalents (518,118) (20,559)
CASH AND CASH EQUIVALENTS, beginning of year 1,204,903 1,225,462
CASH AND CASH EQUIVALENTS, end of year 686,785 1,204,903
Non-cash investing and financing activities:    
Subscriptions receivable 9,062
Cash paid during the year for:    
Interest 47 37
Income taxes $ 14,237 $ 800