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Stockholders' Equity - Stock options by exercise price (Details)	6 Months Ended
	Dec. 31, 2023 $ / shares shares
Options Outstanding	2,847,958
Options Exercisable	2,572,180
Range One
Option Exercise Price | $ / shares	$ 0.70
Options Outstanding	225,000
Remaining Contractual Life (in years)	1 year 11 months 4 days
Options Exercisable	225,000
Range Two
Option Exercise Price | $ / shares	$ 0.77
Options Outstanding	25,000
Remaining Contractual Life (in years)	7 months 17 days
Options Exercisable	25,000
Range Three
Option Exercise Price | $ / shares	$ 0.80
Options Outstanding	16,000
Remaining Contractual Life (in years)	1 year 7 months 20 days
Options Exercisable	16,000
Range Four
Option Exercise Price | $ / shares	$ 0.90
Options Outstanding	15,000
Remaining Contractual Life (in years)	1 year 7 months 2 days
Options Exercisable	15,000
Range Five
Option Exercise Price | $ / shares	$ 1.00
Options Outstanding	15,000
Remaining Contractual Life (in years)	1 year 2 months 8 days
Options Exercisable	15,000
Range Six
Option Exercise Price | $ / shares	$ 1.05
Options Outstanding	305,000
Remaining Contractual Life (in years)	2 years 7 months 24 days
Options Exercisable	305,000
Range Seven
Option Exercise Price | $ / shares	$ 1.09
Options Outstanding	40,000
Remaining Contractual Life (in years)	2 years 4 months 24 days
Options Exercisable	40,000
Range Eight
Option Exercise Price | $ / shares	$ 1.10
Options Outstanding	105,000
Remaining Contractual Life (in years)	1 year 6 months
Options Exercisable	105,000
Range Nine
Option Exercise Price | $ / shares	$ 1.20
Options Outstanding	274,000
Remaining Contractual Life (in years)	3 years 6 months 18 days
Options Exercisable	274,000
Range Ten
Option Exercise Price | $ / shares	$ 1.59
Options Outstanding	25,000
Remaining Contractual Life (in years)	4 years 4 months 9 days
Options Exercisable	25,000
Range Eleven
Option Exercise Price | $ / shares	$ 2.10
Options Outstanding	238,767
Remaining Contractual Life (in years)	8 years 1 month 9 days
Options Exercisable	238,767
Range Twelve
Option Exercise Price | $ / shares	$ 2.13
Options Outstanding	216,708
Remaining Contractual Life (in years)	6 years 10 months 17 days
Options Exercisable	216,708
Range Thirteen
Option Exercise Price | $ / shares	$ 2.15
Options Outstanding	200,000
Remaining Contractual Life (in years)	8 years 11 months 12 days
Options Exercisable	200,000
Range Fourteen
Option Exercise Price | $ / shares	$ 2.17
Options Outstanding	35,955
Remaining Contractual Life (in years)	7 years 4 months 9 days
Options Exercisable	32,958
Range Fifteen
Option Exercise Price | $ / shares	$ 2.19
Options Outstanding	5,000
Remaining Contractual Life (in years)	8 years 18 days
Options Exercisable	3,333
Range Sixteen
Option Exercise Price | $ / shares	$ 2.40
Options Outstanding	302,833
Remaining Contractual Life (in years)	4 years 10 months 13 days
Options Exercisable	302,833
Range Seventeen
Option Exercise Price | $ / shares	$ 2.43
Options Outstanding	61,250
Remaining Contractual Life (in years)	7 years 5 months 4 days
Options Exercisable	58,750
Range Eighteen
Option Exercise Price | $ / shares	$ 2.45
Options Outstanding	98,000
Remaining Contractual Life (in years)	6 years 7 months 2 days
Options Exercisable	98,000
Range Nineteen
Option Exercise Price | $ / shares	$ 2.49
Options Outstanding	78,435
Remaining Contractual Life (in years)	6 years 5 months 1 day
Options Exercisable	78,435
Range Twenty
Option Exercise Price | $ / shares	$ 2.50
Options Outstanding	20,000
Remaining Contractual Life (in years)	5 years 4 months 17 days
Options Exercisable	20,000
Range Twenty One
Option Exercise Price | $ / shares	$ 2.64
Options Outstanding	30,882
Remaining Contractual Life (in years)	7 years 7 months 6 days
Options Exercisable	25,734
Range Twenty Two
Option Exercise Price | $ / shares	$ 2.67
Options Outstanding	33,194
Remaining Contractual Life (in years)	7 years 8 months 19 days
Options Exercisable	27,662
Range Twenty Three
Option Exercise Price | $ / shares	$ 2.73
Options Outstanding	257,934
Remaining Contractual Life (in years)	9 years 11 months 8 days
Range Twenty Four
Option Exercise Price | $ / shares	$ 2.99
Options Outstanding	8,000
Remaining Contractual Life (in years)	6 years 4 months 13 days
Options Exercisable	8,000
Range Twenty Five
Option Exercise Price | $ / shares	$ 3.13
Options Outstanding	208,000
Remaining Contractual Life (in years)	5 years 10 months 13 days
Options Exercisable	208,000
Range Twenty Six
Option Exercise Price | $ / shares	$ 3.50
Options Outstanding	8,000
Remaining Contractual Life (in years)	6 years 1 month 13 days
Options Exercisable	8,000

X

- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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X

- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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X

- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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