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CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
 3 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Cash flows from operating activities:    
Net loss $ (506,296) $ (451,740)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 35,278 43,960
Change in provision for allowance on accounts receivable (6,967) 5,697
Inventory reserve 2,320 715
Stock option expense 5,850 8,084
Increase (reduction) in deferred rent liability (37,971) 3,333
Amortization of right-of-use asset 102,456
Changes in assets and liabilities:    
Accounts receivable 603,107 (219,444)
Inventories (57,568) (30,395)
Reduction in lease liability (54,796)
Prepaid expenses and other assets (41,165) (14,259)
Accounts payable and accrued expenses (55,718) (107,313)
Accrued compensation 3,316 4,704
Net cash used in operating activities (8,154) (756,658)
Cash flows from investing activities:    
Increase in intangibles (12,100) (22,524)
Purchases of property and equipment (2,171) (38,081)
Net cash used in investing activities (14,271) (60,605)
Cash flows from financing activities:    
Proceeds from sale of common stock, net 112,608 179,504
Proceeds from exercise of stock options 34,028 17,875
Net cash provided by financing activities 146,636 197,379
Effect of exchange rate changes in cash (3,442) (1,326)
Net increase (decrease) in cash and cash equivalents 120,769 (621,210)
Cash and cash equivalents at beginning of period 686,785 1,204,903
Cash and cash equivalents at end of period 807,554 583,693
Cash paid during the period for:    
Interest 47
Non-cash    
Establishment of Right-Of-Use Asset per ASC 842 1,942,999
Establishment of Lease Liability per ASC 842 $ 1,980,970