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Condensed Consolidated Statements of Shareholders' Equity - USD ($) | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Receivables from Stockholder [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Mar. 31, 2019 |  | $ 384,648 | $ 19,687,263 | $ (2,200) | $ (11,569,556) | $ 8,500,155
Balance, shares at Mar. 31, 2019 |  | 38,464,753 |  |  |  |
Net income |  |  |  |  | (2,857,000) | (2,857,000)
Issuance of common stock - directors |  | $ 328 | 12,172 |  |  | 12,500
Issuance of common stock - directors, shares |  | 32,890 |  |  |  |
Employee compensation-stock option |  |  | 20,008 |  |  | 20,008
Exercise of stock options |  | $ 600 | 9,600 |  |  | 10,200
Exercise of stock options, shares |  | 60,000 |  |  |  |
Collection of subscription receivable |  |  |  | 2,200 |  | 2,200
Balance at Mar. 31, 2020 |  | $ 385,576 | 19,729,043 |  | (14,426,556) | 5,688,063
Balance, shares at Mar. 31, 2020 |  | 38,557,643 |  |  |  |
Net income |  |  |  |  | 3,368,365 | 3,368,365
Issuance of common stock - directors |  | $ 431 | 12,069 |  |  | 12,500
Issuance of common stock - directors, shares |  | 43,105 |  |  |  |
Employee compensation-stock option |  |  | 5,105 |  |  | 5,105
Exercise of stock options |  | $ 4,400 | 22,000 |  |  | 26,400
Exercise of stock options, shares |  | 440,000 |  |  |  |
Balance at Dec. 31, 2020 |  | $ 390,407 | 19,768,217 |  | (11,058,191) | 9,100,433
Balance, shares at Dec. 31, 2020 |  | 39,040,748 |  |  |  |
Balance at Mar. 31, 2020 |  | $ 385,576 | 19,729,043 |  | (14,426,556) | 5,688,063
Balance, shares at Mar. 31, 2020 |  | 38,557,643 |  |  |  |
Net income |  |  |  |  | 2,172,365 | 2,172,365
Issuance of common stock - directors |  | $ 431 | 12,069 |  |  | 12,500
Issuance of common stock - directors, shares |  | 43,105 |  |  |  |
Employee compensation-stock option |  |  | 10,210 |  |  | 10,210
Exercise of stock options |  | $ 4,400 | 22,000 |  |  | 26,400
Exercise of stock options, shares |  | 440,000 |  |  |  |
Balance at Mar. 31, 2021 |  | $ 390,407 | 19,773,322 |  | (12,254,191) | 7,909,538
Balance, shares at Mar. 31, 2021 |  | 39,040,748 |  |  |  |
Balance at Sep. 30, 2020 |  | $ 385,576 | 19,729,043 |  | (12,225,486) | 7,889,133
Balance, shares at Sep. 30, 2020 |  | 38,557,643 |  |  |  |
Net income |  |  |  |  | 1,167,295 | 1,167,295
Issuance of common stock - directors |  | $ 431 | 12,069 |  |  | 12,500
Issuance of common stock - directors, shares |  | 43,105 |  |  |  |
Employee compensation-stock option |  |  | 5,105 |  |  | 5,105
Exercise of stock options |  | $ 4,400 | 22,000 |  |  | 26,400
Exercise of stock options, shares |  | 440,000 |  |  |  |
Balance at Dec. 31, 2020 |  | $ 390,407 | 19,768,217 |  | (11,058,191) | 9,100,433
Balance, shares at Dec. 31, 2020 |  | 39,040,748 |  |  |  |
Balance at Mar. 31, 2021 |  | $ 390,407 | 19,773,322 |  | (12,254,191) | 7,909,538
Balance, shares at Mar. 31, 2021 |  | 39,040,748 |  |  |  |
Net income |  |  |  |  | 1,999,655 | 1,999,655
Issuance of stock |  | $ 165,000 | 4,785,000 |  |  | 4,950,000
Issuance of stock, shares |  | 16,500,001 |  |  |  |
Issuance of pre-funded warrants |  |  | 4,881,667 |  |  | 4,881,667
Payment of stock issuance expenses |  |  | (831,087) |  |  | (831,087)
Issuance of stock for stock issuance expenses |  | $ 5,714 | (5,714) |  |  |
Issuance of stock for stock issuance expenses, shares |  | 571,428 |  |  |  |
Redemption and retirement of treasury shares |  | $ (196,231) | (4,111,459) |  | (2,854,762) | (7,162,452)
Redemption and retirement of treasury shares, shares |  | (19,623,155) |  |  |  |
Issuance of common stock - directors |  | $ 172 | 4,828 |  |  | 5,000
Issuance of common stock - directors, shares |  | 17,242 |  |  |  |
Issuance of common stock - non-employee |  | $ 500 | 16,500 |  |  | 17,000
Issuance of common stock - non-employee, shares |  | 50,000 |  |  |  |
Employee compensation-stock option |  |  | 16,376 |  |  | 16,376
Exercise of stock options |  | $ 800 | 13,200 |  |  | 14,000
Exercise of stock options, shares |  | 80,000 |  |  |  |
Balance at Dec. 31, 2021 |  | $ 366,362 | 24,542,633 |  | (13,109,298) | 11,799,697
Balance, shares at Dec. 31, 2021 |  | 36,636,264 |  |  |  |
Balance at Sep. 30, 2021 |  | $ 365,762 | 24,530,384 |  | (14,535,193) | 10,360,953
Balance, shares at Sep. 30, 2021 |  | 36,576,264 |  |  |  |
Net income |  |  |  |  | 1,425,895 | 1,425,895
Issuance of stock |  |  |  |  |  |
Issuance of stock, shares |  |  |  |  |  |
Issuance of common stock - directors |  |  |  |  |  |
Employee compensation-stock option |  |  | 3,649 |  |  | 3,649
Exercise of stock options |  | $ 600 | 8,600 |  |  | 9,200
Exercise of stock options, shares |  | 60,000 |  |  |  |
Balance at Dec. 31, 2021 |  | $ 366,362 | $ 24,542,633 |  | $ (13,109,298) | $ 11,799,697
Balance, shares at Dec. 31, 2021 |  | 36,636,264 |  |  |  |

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