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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
 9 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Cash flows from operating activities:    
Net loss $ (562,741) $ (274,105)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 163,587 174,554
Stock option expense 10,009 25,869
Change in provision for allowance on accounts receivable 59,190 (9,012)
Inventory reserve (12,799) 12,220
Increase (decrease) in deferred rent liability 2,510 (20,573)
Increase in deferred tax assets (254,000)
Changes in assets and liabilities:    
Accounts receivable (161,562) 200,638
Inventories 57,666 (84,949)
Prepaid expenses and other (98,452) 62,269
Accounts payable and accrued expenses 170,869 (44,559)
Other assets (9,185) (11,448)
Accrued compensation (8,472) 28,040
Net cash used in operating activities (389,380) (195,056)
Cash flows from investing activities:    
Increase in intangibles (925)
Purchases of property and equipment (95,833) (69,998)
Net cash used in investing activities (95,833) (70,923)
Cash flows from financing activities:    
Proceeds from exercise of stock options 138,997 38,256
Net cash provided by financing activities 138,997 38,256
Effect of exchange rate changes in cash (1,001) (1,439)
Net decrease in cash and cash equivalents (347,217) (229,162)
Cash and cash equivalents at beginning of period 1,888,925 1,088,307
Cash and cash equivalents at end of period 1,541,708 859,145
Non-cash investing and financing activities:    
Exercise of stock options for reduction of accrued expenses 14,190
Cash paid during the period for:    
Interest 242 17
Income taxes $ 800 $ 800