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CONDENSED STATEMENTS OF EARNINGS (UNAUDITED) - USD ($)
 3 Months Ended 9 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2018
Nov. 30, 2017
REVENUES $ 40,482,600 $ 38,909,900 $ 95,185,900 $ 90,038,000
COST OF GOODS SOLD 13,141,600 12,211,700 31,274,000 28,460,800
Gross margin 27,341,000 26,698,200 63,911,900 61,577,200
OPERATING EXPENSE:        
Operating and selling 6,540,600 6,121,100 14,554,400 13,684,200
Sales commissions 12,689,200 12,510,400 29,375,300 28,759,300
General and administrative 4,476,000 4,735,200 12,106,900 12,359,600
Total operating expenses 23,705,800 23,366,700 56,036,600 54,803,100
INTEREST EXPENSE 228,600 287,600 712,000 863,800
OTHER INCOME (397,600) (388,900) (1,172,300) (1,187,400)
EARNINGS BEFORE INCOME TAXES 3,804,200 3,432,800 8,335,600 7,097,700
INCOME TAXES 988,600 1,304,400 2,212,700 2,707,100
NET EARNINGS $ 2,815,600 $ 2,128,400 $ 6,122,900 $ 4,390,600
BASIC AND DILUTED EARNINGS PER SHARE        
Basic (in Dollars per share) $ 0.34 $ 0.26 $ 0.75 $ 0.54
Diluted (in Dollars per share) $ 0.34 $ 0.26 $ 0.75 $ 0.54
WEIGHTED AVERAGE NUMBER OF COMMON AND EQUIVALENT SHARES OUTSTANDING        
Basic (in Shares) 8,194,072 8,174,536 8,185,561 8,175,372
Diluted (in Shares) 8,201,776 8,180,022 8,193,206 8,180,106
Dividends per share (in Dollars per share) $ 0.10 $ 0.15
Gross revenue [Member]        
REVENUES $ 53,486,000 $ 44,383,700 $ 125,574,400 $ 109,395,400
Discounts and Allowances [Member]        
REVENUES (16,572,600) (9,249,500) (38,918,700) (28,317,300)
Transportation Revenue [Member]        
REVENUES $ 3,569,200 $ 3,775,700 $ 8,530,200 $ 8,959,900