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Stockholders' Equity (Tables) | 6 Months Ended
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Dec. 31, 2021
Stockholders' Equity |
Schedule of vested and unvested stock option activity | The following table summarizes vested and unvested stock option activity: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | All Options | ​ | Vested Options | ​ | Unvested Options
​ |  | ​ |  | Weighted |  | ​ |  | Weighted |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Exercise | ​ | ​ | ​ | Exercise | ​ | ​ | ​ | Exercise
​ | ​ | Shares | ​ | Price | ​ | Shares | ​ | Price | ​ | Shares | ​ | Price
Outstanding at June 30, 2021 |  | 3,258,408 |  | $ | 1.68 |  | 2,930,474 |  | $ | 1.60 |  | 327,934 |  | $ | 2.46
Granted |  | 64,076 |  | ​ | 2.66 |  | — |  | ​ | — |  | 64,076 |  | ​ | 2.66
Options vesting |  | — |  | ​ | — |  | 134,295 |  | ​ | 2.46 |  | (134,295) |  | ​ | 2.46
Exercised |  | (49,634) |  | ​ | 0.90 |  | (49,634) |  | ​ | 0.90 |  | — |  | ​ | —
Forfeited |  | — |  | ​ | — |  | — |  | ​ | — |  | — |  | ​ | —
Repurchased |  | — |  | ​ | — |  | — |  | ​ | — |  | — |  | ​ | —
Outstanding at December 31, 2021 |  | 3,272,850 | ​ | $ | 1.71 |  | 3,015,135 | ​ | $ | 1.65 |  | 257,715 | ​ | $ | 2.47
Schedule of valuation assumptions | The following table presents the assumptions used to estimate the fair values based upon a Black-Scholes option pricing model of the stock options granted during the six months ended December 31, 2021 and 2020. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended |  | ​
​ | ​ | December 31, | ​ | ​
​ |  | 2021 |  | 2020 | ​ | ​
Expected dividend yield |  | 0 | % | 0 | % | ​
Risk-free interest rate |  | 0.92 - 1.01 | % | 0.37 - 0.51 | % | ​
Expected life (in years) |  | 6 |  | 5 - 6 | ​ | ​
Expected volatility |  | 56 | % | 60 - 63 | % | ​
Schedule of additional information regarding stock options outstanding and exercisable | Additional information regarding stock options outstanding and exercisable as of December 31, 2021 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Option |  | ​ |  | Remaining |  | ​
​ | Exercise | ​ | Options | ​ | Contractual | ​ | Options
​ | Price | ​ | Outstanding | ​ | Life (in years) | ​ | Exercisable
$ | 0.70 |  | 225,000 |  | 3.93 |  | 225,000
​ | 0.77 |  | 25,000 |  | 2.63 |  | 25,000
​ | 0.80 |  | 16,000 |  | 3.64 |  | 16,000
​ | 0.90 |  | 25,667 |  | 2.31 |  | 25,667
​ | 0.97 |  | 6,000 |  | 0.50 |  | 6,000
​ | 1.00 |  | 28,249 |  | 1.93 |  | 28,249
​ | 1.02 |  | 2,000 |  | 0.50 |  | 2,000
​ | 1.05 |  | 315,529 |  | 4.51 |  | 315,529
​ | 1.07 |  | 33,898 |  | 0.79 |  | 33,898
​ | 1.09 |  | 75,000 |  | 3.62 |  | 75,000
​ | 1.10 |  | 105,000 |  | 3.50 |  | 105,000
​ | 1.15 |  | 128,400 |  | 1.10 |  | 128,400
​ | 1.20 |  | 274,000 |  | 5.55 |  | 274,000
​ | 1.25 |  | 32,000 |  | 1.12 |  | 32,000
​ | 1.30 |  | 243,000 |  | 0.18 |  | 243,000
​ | 1.50 |  | 185,000 |  | 0.97 |  | 185,000
​ | 1.59 |  | 25,000 |  | 6.36 |  | 25,000
​ | 1.80 |  | 94,050 |  | 1.63 |  | 94,050
​ | 1.85 |  | 17,800 |  | 1.29 |  | 17,800
​ | 1.95 |  | 200,000 |  | 6.51 |  | 200,000
​ | 2.13 | ​ | 216,708 | ​ | 8.88 | ​ | 206,960
​ | 2.17 | ​ | 35,955 | ​ | 9.36 | ​ | —
​ | 2.40 |  | 332,833 |  | 6.87 |  | 332,833
​ | 2.43 | ​ | 61,250 | ​ | 9.43 | ​ | 31,250
​ | 2.45 | ​ | 173,000 | ​ | 8.59 | ​ | 86,500
​ | 2.49 | ​ | 88,435 | ​ | 8.34 | ​ | 66,666
​ | 2.50 | ​ | 20,000 | ​ | 7.38 | ​ | 18,333
​ | 2.64 | ​ | 30,882 | ​ | 9.60 | ​ | —
​ | 2.67 | ​ | 33,194 | ​ | 9.72 | ​ | —
​ | 2.99 | ​ | 8,000 | ​ | 8.37 | ​ | 4,667
​ | 3.13 | ​ | 208,000 | ​ | 7.87 | ​ | 206,000
​ | 3.50 | ​ | 8,000 | ​ | 8.12 | ​ | 5,333
​ | Total | ​ | 3,272,850 | ​ | ​ | ​ | 3,015,135
Schedule of warrant activity | The following table summarizes warrant activity: ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Exercise
​ | ​ | Warrants | ​ | Price
Outstanding, June 30, 2021 |  | 50,000 | ​ | $ | 1.19
Granted |  | — | ​ |  | —
Exercised |  | (50,000) | ​ |  | 1.19
Repurchased |  | — | ​ |  | —
Expired/Cancelled |  | — | ​ |  | —
Outstanding, December 31, 2021 |  | — | ​ | $ | —
Exercisable, June 30, 2021 |  | 50,000 | ​ | $ | 1.19
Exercisable, December 31, 2021 |  | — | ​ | $ | —
Schedule of restricted common stock activity | The following table summarizes restricted common stock activity: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted
​ | ​ | ​ | ​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | ​ | ​ | ​ | Grant Date
​ | ​ | Shares | ​ | Fair Value | ​ | Fair Value
Non-vested, June 30, 2021 |  | 245,252 | ​ | $ | 481,953 | ​ | $ | 2.47
Granted |  | 250,997 | ​ |  | 643,842 | ​ |  | 2.57
Vested |  | (150,523) | ​ |  | (343,981) | ​ |  | 2.51
Forfeited |  | — | ​ |  | — | ​ |  | —
Non-vested, December 31, 2021 |  | 345,726 | ​ | $ | 781,814 | ​ | $ | 2.52

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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