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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
 6 Months Ended
Nov. 30, 2017
Nov. 30, 2016
Cash flows from operating activities:    
Net loss $ (475,720) $ (258,600)
Adjustments to reconcile net loss to net cash used in operating activities    
Depreciation and amortization 94,133 110,994
Stock option expense 4,624 1,237
Change in provision for allowance for doubtful accounts 7,514 21,921
Inventory reserve (343) (9,842)
Increase (decrease) in deferred rent liability 13,000 (3,604)
Changes in assets and liabilities:    
Accounts receivable (2,545) (193,134)
Inventories (97,204) (8,188)
Prepaid expenses and other (169,336) (32,768)
Accounts payable and accrued expenses 245,393 41,174
Accrued compensation 17,134 22,919
Net cash used in operating activities (363,350) (307,891)
Cash flows from investing activities:    
Purchases of property and equipment (52,923) (25,682)
Net cash used in investing activities (52,923) (25,682)
Cash flows from financing activities:    
Proceeds from exercise of stock options 13,789 56,556
Net cash provided by financing activities 13,789 56,556
Effect of exchange rate changes on cash (5,168) (760)
Net decrease in cash and cash equivalents (407,652) (277,777)
Cash and cash equivalents at beginning of period 1,225,462 1,888,925
Cash and cash equivalents at end of period 817,810 1,611,148
Cash paid during the period for:    
Interest 37 180
Income taxes $ 0 $ 0