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Stockholders' Equity - Stock options outstanding and exercisable (Details)	12 Months Ended
	Jun. 30, 2021 $ / shares shares
Options Outstanding	3,258,408
Options Exercisable	2,930,474
Range One
Option Exercise Price | $ / shares	$ 0.59
Options Outstanding	8,150
Remaining Contractual Life (in years)	1 year
Options Exercisable	8,150
Range Two
Option Exercise Price | $ / shares	$ 0.60
Options Outstanding	5,000
Remaining Contractual Life (in years)	1 year
Options Exercisable	5,000
Range Three
Option Exercise Price | $ / shares	$ 0.65
Options Outstanding	6,150
Remaining Contractual Life (in years)	1 year
Options Exercisable	6,150
Range Four
Option Exercise Price | $ / shares	$ 0.70
Options Outstanding	225,000
Remaining Contractual Life (in years)	4 years 5 months 4 days
Options Exercisable	225,000
Range Five
Option Exercise Price | $ / shares	$ 0.77
Options Outstanding	49,500
Remaining Contractual Life (in years)	2 years 29 days
Options Exercisable	49,500
Range Six
Option Exercise Price | $ / shares	$ 0.80
Options Outstanding	16,000
Remaining Contractual Life (in years)	4 years 1 month 20 days
Options Exercisable	16,000
Range Seven
Option Exercise Price | $ / shares	$ 0.90
Options Outstanding	25,667
Remaining Contractual Life (in years)	2 years 9 months 21 days
Options Exercisable	25,667
Range Eight
Option Exercise Price | $ / shares	$ 0.97
Options Outstanding	6,000
Remaining Contractual Life (in years)	1 year
Options Exercisable	6,000
Range Nine
Option Exercise Price | $ / shares	$ 1.00
Options Outstanding	28,249
Remaining Contractual Life (in years)	2 years 5 months 4 days
Options Exercisable	28,249
Range Ten
Option Exercise Price | $ / shares	$ 1.02
Options Outstanding	2,000
Remaining Contractual Life (in years)	1 year
Options Exercisable	2,000
Range Eleven
Option Exercise Price | $ / shares	$ 1.05
Options Outstanding	315,529
Remaining Contractual Life (in years)	5 years 3 days
Options Exercisable	315,529
Range Twelve
Option Exercise Price | $ / shares	$ 1.07
Options Outstanding	33,898
Remaining Contractual Life (in years)	1 year 3 months 14 days
Options Exercisable	33,898
Range Thirteen
Option Exercise Price | $ / shares	$ 1.09
Options Outstanding	75,000
Remaining Contractual Life (in years)	4 years 1 month 13 days
Options Exercisable	75,000
Range Fourteen
Option Exercise Price | $ / shares	$ 1.10
Options Outstanding	105,000
Remaining Contractual Life (in years)	4 years
Options Exercisable	105,000
Range Fifteen
Option Exercise Price | $ / shares	$ 1.15
Options Outstanding	128,400
Remaining Contractual Life (in years)	1 year 7 months 9 days
Options Exercisable	128,400
Range Sixteen
Option Exercise Price | $ / shares	$ 1.20
Options Outstanding	274,000
Remaining Contractual Life (in years)	6 years 18 days
Options Exercisable	274,000
Range Seventeen
Option Exercise Price | $ / shares	$ 1.25
Options Outstanding	32,000
Remaining Contractual Life (in years)	1 year 7 months 13 days
Options Exercisable	32,000
Range Eighteen
Option Exercise Price | $ / shares	$ 1.30
Options Outstanding	243,000
Remaining Contractual Life (in years)	8 months 4 days
Options Exercisable	243,000
Range Nineteen
Option Exercise Price | $ / shares	$ 1.50
Options Outstanding	185,000
Remaining Contractual Life (in years)	1 year 5 months 23 days
Options Exercisable	185,000
Range Twenty
Option Exercise Price | $ / shares	$ 1.59
Options Outstanding	25,000
Remaining Contractual Life (in years)	6 years 10 months 13 days
Options Exercisable	25,000
Range Twenty One
Option Exercise Price | $ / shares	$ 1.80
Options Outstanding	94,050
Remaining Contractual Life (in years)	2 years 1 month 17 days
Options Exercisable	94,050
Range Twenty Two
Option Exercise Price | $ / shares	$ 1.85
Options Outstanding	17,800
Remaining Contractual Life (in years)	1 year 9 months 18 days
Options Exercisable	17,800
Range Twenty Three
Option Exercise Price | $ / shares	$ 1.95
Options Outstanding	200,000
Remaining Contractual Life (in years)	7 years 3 days
Options Exercisable	200,000
Range Twenty Four
Option Exercise Price | $ / shares	$ 2.13
Options Outstanding	216,708
Remaining Contractual Life (in years)	9 years 4 months 20 days
Options Exercisable	200,000
Range Twenty Five
Option Exercise Price | $ / shares	$ 2.17
Options Outstanding	35,955
Remaining Contractual Life (in years)	9 years 10 months 13 days
Options Exercisable	0
Range Twenty Six
Option Exercise Price | $ / shares	$ 2.40
Options Outstanding	338,667
Remaining Contractual Life (in years)	7 years 4 months 17 days
Options Exercisable	326,000
Range Twenty Seven
Option Exercise Price | $ / shares	$ 2.43
Options Outstanding	61,250
Remaining Contractual Life (in years)	9 years 11 months 4 days
Options Exercisable	31,250
Range Twenty Eight
Option Exercise Price | $ / shares	$ 2.45
Options Outstanding	173,000
Remaining Contractual Life (in years)	9 years 1 month 6 days
Options Exercisable	0
Range Twenty Nine
Option Exercise Price | $ / shares	$ 2.49
Options Outstanding	88,435
Remaining Contractual Life (in years)	8 years 10 months 2 days
Options Exercisable	45,832
Range Thirty
Option Exercise Price | $ / shares	$ 2.50
Options Outstanding	20,000
Remaining Contractual Life (in years)	7 years 10 months 17 days
Options Exercisable	15,000
Range Thirty One
Option Exercise Price | $ / shares	$ 2.99
Options Outstanding	8,000
Remaining Contractual Life (in years)	8 years 10 months 13 days
Options Exercisable	3,333
Range Thirty Two
Option Exercise Price | $ / shares	$ 3.13
Options Outstanding	208,000
Remaining Contractual Life (in years)	8 years 4 months 17 days
Options Exercisable	204,666
Range Thirty Three
Option Exercise Price | $ / shares	$ 3.50
Options Outstanding	8,000
Remaining Contractual Life (in years)	8 years 7 months 13 days
Options Exercisable	4,000

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

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+ References

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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