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Note 10 - REVENUE RECOGNITION (Details) - Schedule of New Accounting Pronouncements and Changes in Accounting Principles - USD ($)
 3 Months Ended 9 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2018
Nov. 30, 2017
Feb. 28, 2018
ASSETS          
Accounts receivable—Net $ 3,550,200   $ 3,550,200   $ 2,913,700
Inventories—Net 30,646,000   30,646,000   26,618,600
Prepaid expenses and other assets 1,583,400   1,583,400   1,259,000
Total current assets 43,620,100   43,620,100   33,514,600
TOTAL ASSETS 71,747,400   71,747,400   61,837,900
LIABILITIES          
Other current liabilities 4,116,100   4,116,100   3,517,900
Total liabilities 45,999,700   45,999,700   41,435,800
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  
Topic 606 [Member]          
ASSETS          
Accounts receivable—Net         (99,900)
Inventories—Net         (100)
Prepaid expenses and other assets         (117,000)
Total current assets         (217,000)
TOTAL ASSETS         (217,000)
LIABILITIES          
Other current liabilities         (217,000)
Total liabilities         (217,000)
REVENUES   (1,900)   (17,900)  
COST OF GOODS SOLD   (1,716,900)   (3,881,600)  
Gross margin   1,715,000   3,863,700  
OPERATING EXPENSE:          
Operating and selling   1,716,200   3,865,700  
Sales commissions   0   0  
General and administrative   0   0  
Total operating expenses   1,716,200   3,865,700  
INTEREST EXPENSE   0   0  
OTHER INCOME   (1,200)   (2,000)  
EARNINGS BEFORE INCOME TAXES   0   0  
INCOME TAXES   0   0  
NET EARNINGS   0   0  
Without Adoption [Member]          
ASSETS          
Accounts receivable—Net         2,813,800
Inventories—Net         26,618,500
Prepaid expenses and other assets         1,142,000
Total current assets         33,297,600
TOTAL ASSETS         61,620,900
LIABILITIES          
Other current liabilities         3,300,900
Total liabilities         $ 41,218,800
REVENUES   38,908,000   90,020,100  
COST OF GOODS SOLD   10,494,800   24,579,200  
Gross margin   28,413,200   65,440,900  
OPERATING EXPENSE:          
Operating and selling   7,837,300   17,549,900  
Sales commissions   12,510,400   28,759,300  
General and administrative   4,735,200   12,359,600  
Total operating expenses   25,082,900   58,668,800  
INTEREST EXPENSE   287,600   863,800  
OTHER INCOME   (390,100)   (1,189,400)  
EARNINGS BEFORE INCOME TAXES   3,432,800   7,097,700  
INCOME TAXES   1,304,400   2,707,100  
NET EARNINGS   2,128,400   4,390,600  
Gross revenue [Member]          
LIABILITIES          
REVENUES 53,486,000 44,383,700 125,574,400 109,395,400  
Gross revenue [Member] | Topic 606 [Member]          
LIABILITIES          
REVENUES   (2,489,100)   (8,405,900)  
Gross revenue [Member] | Without Adoption [Member]          
LIABILITIES          
REVENUES   41,894,600   100,989,500  
Discounts and Allowances [Member]          
LIABILITIES          
REVENUES (16,572,600) (9,249,500) (38,918,700) (28,317,300)  
Discounts and Allowances [Member] | Topic 606 [Member]          
LIABILITIES          
REVENUES   2,487,200   8,388,000  
Discounts and Allowances [Member] | Without Adoption [Member]          
LIABILITIES          
REVENUES   (6,762,300)   (19,929,300)  
Transportation Revenue [Member]          
LIABILITIES          
REVENUES $ 3,569,200 3,775,700 $ 8,530,200 8,959,900  
Transportation Revenue [Member] | Topic 606 [Member]          
LIABILITIES          
REVENUES   0   0  
Transportation Revenue [Member] | Without Adoption [Member]          
LIABILITIES          
REVENUES   $ 3,775,700   $ 8,959,900