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Condensed Consolidated Statements of Income - USD ($)
3 Months Ended 9 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2021
Feb. 29, 2020
Income Statement [Abstract]        
Sales, net $ 4,772,371 $ 7,234,195 $ 15,249,425 $ 20,645,259
Cost of goods sold 4,368,784 4,861,257 12,714,882 13,947,722
     Gross profit 403,587 2,372,938 2,534,543 6,697,537
Selling, general, and administrative expenses 1,223,275 1,437,981 3,832,682 4,254,839
     Operating income (loss) (819,688) 934,957 (1,298,139) 2,442,698
Other income, net 643,006 36,795 2,122,758 100,637
     Income (loss) before provision for income taxes (176,682) 971,752 824,619 2,543,335
Provision for income taxes (benefit) (359,000) 189,000 (179,000) 489,000
     Net income $ 182,318 $ 782,752 $ 1,003,619 $ 2,054,335
Basic and diluted earnings per common share $ 0.05 $ 0.22 $ 0.29 $ 0.59