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Stock Options (Stock Option Activity) (Details) - USD ($) | 12 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Stock Options [Abstract] |  |  |
Shares under option, number of shares (in shares) | 2,721,875 | 2,592,875 |
Granted, number of shares (in shares) | 615,000 | 555,000 |
Exercised, number of shares (in shares) | (1,203,875) |  |
Expired, number of shares (in shares) | (385,000) | (362,000) |
Forfeited, number of shares (in shares) |  | (64,000) |
Shares under option, number of shares (in shares) | 1,748,000 | 2,721,875 | 2,592,875
Exercisable, number of shares (in shares) | 288,000 | 1,408,709 |
Shares under option, stock options price range, lower limit (in dollars per share) | $ 1.77 | $ 1.77 |
Shares under option, stock options price range, upper limit (in dollars per share) | 6.00 | 6.28 |
Granted, stock options price range, lower limit (in dollars per share) | 1.73 | 1.97 |
Granted, stock options price range, upper limit (in dollars per share) | 2.11 | 2.17 |
Exercised, stock options price range, lower limit (in dollars per share) | 1.77 |  |
Exercised, stock options price range, upper limit (in dollars per share) | 6.00 |  |
Expired, stock options price range, lower limit (in dollars per share) | 1.77 | 2.20 |
Expired, stock options price range, upper limit (in dollars per share) | 5.24 | 6.28 |
Forfeited, stock options price range, lower limit (in dollars per share) |  | 1.77 |
Forfeited, stock options price range, upper limit (in dollars per share) |  | 2.65 |
Shares under option, stock options price range, lower limit (in dollars per share) | 1.73 | 1.77 | $ 1.77
Shares under option, stock options price range, upper limit (in dollars per share) | 6.00 | 6.00 | 6.28
Exercisable, stock options price range, lower limit (in dollars per share) | 1.73 | 1.77 |
Exercisable, stock options price range, upper limit (in dollars per share) | 6.00 | 6.00 |
Shares under option, weighted average exercise price (in dollars per share) | 2.73 | 2.96 |
Granted, weighted average exercise price (in dollars per share) | 1.84 | 2.08 |
Exercised, weighted average exercise price (in dollars per share) | 2.75 |  |
Expired, weighted average exercise price (in dollars per share) | 3.24 | 3.53 |
Forfeited, weighted average exercise price (in dollars per share) |  | 2.15 |
Shares under option, weighted average exercise price (in dollars per share) | 2.29 | 2.73 | $ 2.96
Exercisable, weighted average exercise price (in dollars per share) | $ 3.19 | $ 3.12 |
Shares under option, weighted average remaining contractual life (Year) | 4 years 10 months 9 days | 4 years 9 months 25 days | 4 years 2 months 23 days
Exercisable, weighted average remaining contractual life (Year) | 2 years 9 months 21 days | 2 years 7 months 9 days |
Shares under option, aggregate intrinsic value of in-the-money options | $ 36,594,280 |  | $ 48,280
Exercisable, aggregate intrinsic value of in-the-money options | $ 5,767,425 |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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