XML 64 R48.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Note 8 - Stockholders' Equity (Details Textual) - USD ($) |  |  |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 21, 2021 | Apr. 07, 2021 | Feb. 11, 2021 | Dec. 18, 2020 | Oct. 28, 2020 | Oct. 21, 2020 | Jul. 23, 2020 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020
Common Stock, Par or Stated Value Per Share (in dollars per share) |  |  |  | $ 0.001 |  |  | $ 0.001 |  | $ 0.001 | $ 0.001 |
Proceeds from Issuance or Sale of Equity, Total |  |  | $ 37,300,000 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  |  | $ 2.40 | $ 2.40 | $ 5.14
Preferred Stock, Shares Issued, Total (in shares) |  |  |  |  |  |  |  |  | 280,898 | 280,898 |
Equity Securities, Notice of Deficiency, Failure to Maintain Minimum Bid Price, Amount (in dollars per share) |  | $ 1.00 |  |  |  |  |  |  |  |  |
Equity Securities, Minimum Closing Bid Price (in dollars per share) | $ 1.00 | $ 1.00 |  |  |  |  |  |  |  |  |
Equity Securities, Threshold Consecutive Trading Days (Day) | 10 days | 10 days |  |  |  |  |  |  |  |  |
HCWainwrightCoLLC [Member] |  |  |  |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  | $ 1.395 |  |  |  |  |  |  |  |
Percentage of Underwriting Discount, Price Per Share |  |  | 7.00% |  |  |  |  |  |  |  |
Stock Issued During Period, Option to Purchase Additional Shares, Term (Day) |  |  | 30 days |  |  |  |  |  |  |  |
The “Placement Agent’s Warrants No. 1” [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  |  |  | 469,565 |  |  |
Percentage of Shares Sold in Offering |  |  |  |  |  |  |  | 6.00% |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  |  |  | $ 2.875 |  |  |
Percentage of Per Share Offering Price of Shares |  |  |  |  |  |  |  | 125.00% |  |  |
Class of Warrant or Right, Fair Value Price (in dollars per share) |  |  |  |  |  |  |  | $ 2.01 |  |  |
The “Placement Agent’s Warrants No. 2” [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  |  |  | 173,274 |  |  |  |  |
Percentage of Shares Sold in Offering |  |  |  |  |  | 6.00% |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  |  |  | $ 2.6875 |  |  |  |  |
Percentage of Per Share Offering Price of Shares |  |  |  |  |  | 125.00% |  |  |  |  |
Class of Warrant or Right, Fair Value Price (in dollars per share) |  |  |  |  |  | $ 1.80 |  |  |  |  |
The “Placement Agent’s Warrants No. 3” [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  |  | 170,732 |  |  |  |  |  |  |
Percentage of Shares Sold in Offering |  |  |  | 6.00% |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  |  | $ 4.0625 |  |  |  |  |  |  |
Percentage of Per Share Offering Price of Shares |  |  |  | 125.00% |  |  |  |  |  |  |
Class of Warrant or Right, Fair Value Price (in dollars per share) |  |  |  | $ 2.94 |  |  |  |  |  |  |
The “Underwriter Warrants” [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) |  |  | 1,493,150 |  |  |  |  |  |  |  |
Percentage of Shares Sold in Offering |  |  | 6.00% |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) |  |  | $ 1.875 |  |  |  |  |  |  |  |
Underwritten Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 21,639,851 |  |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  | $ 1.50 |  |  |  |  |  |  |  |
Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  | 3,245,977 |  |  |  |  |  |  |  |
The “Wainwright ATM Agreement” [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Common Stock Issuable, Aggregate Offering Price |  |  |  |  | $ 3,582,614 |  |  |  |  |  |
Common Stock [Member] | The “Public Offering Shares” [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  | 7,826,086 |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  |  |  | $ 2.30 |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  |  |  |  |  |  | $ 18,000,000.0 |  |  |  |
Common Stock [Member] | The “October Registered Offering” [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  | 2,887,906 |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  |  |  | $ 2.15 |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  |  |  |  |  | $ 6,200,000 |  |  |  |  |
Common Stock [Member] | The “February Registered Offering” [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  | 2,845,535 |  |  |  |  |  |  |
Shares Issued, Price Per Share (in dollars per share) |  |  |  | $ 3.25 |  |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  |  |  | $ 9,250,000 |  |  |  |  |  |  |
Common Stock [Member] | The “Wainwright ATM Agreement” [Member] |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  | 1,139,323 |  |  |  |  |  |
Proceeds from Issuance or Sale of Equity, Total |  |  |  |  | $ 3,600,000 |  |  |  |  |  |
Shares Issued, Weighted Average Price Per Share (in dollars per share) |  |  |  |  | $ 3.14 |  |  |  |  |  |
Series D Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued, Total (in shares) |  |  |  |  |  |  |  |  | 280,898 |  |
Preferred Stock, Conversion Basis |  |  |  |  |  |  |  |  | 1 |  |

X
- Definition Represents the fair value of warrants or rights. + References No definition available. + Details
Name: | astc_ClassOfWarrantOrRightFairValuePrice
Namespace Prefix: | astc_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the aggregate offering price of common stock issuable. + References No definition available. + Details
Name: | astc_CommonStockIssuableAggregateOfferingPrice
Namespace Prefix: | astc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the minimum bid price required by NASDAQ. + References No definition available. + Details
Name: | astc_EquitySecuritiesMinimumClosingBid
Namespace Prefix: | astc_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the minimum bid price required by NASDAQ. + References No definition available. + Details
Name: | astc_EquitySecuritiesNoticeOfDeficiencyFailureToMaintainMinimumBidPriceAmount
Namespace Prefix: | astc_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the threshold period of specified consecutive trading days. + References No definition available. + Details
Name: | astc_EquitySecuritiesThresholdConsecutiveTradingDays
Namespace Prefix: | astc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents percentage of per share offering price of shares. + References No definition available. + Details
Name: | astc_PercentageOfPerShareOfferingPriceOfShares
Namespace Prefix: | astc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of shares sold in offering. + References No definition available. + Details
Name: | astc_PercentageOfSharesSoldInOffering
Namespace Prefix: | astc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of underwriting discount for price per share. + References No definition available. + Details
Name: | astc_PercentageOfUnderwritingDiscountPricePerShare
Namespace Prefix: | astc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the weighted average price per share if shares issued. + References No definition available. + Details
Name: | astc_SharesIssuedWeightedAveragePricePerShare
Namespace Prefix: | astc_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the term length from time of issuance to execute options for the purchase of additional shares. + References No definition available. + Details
Name: | astc_StockIssuedDuringPeriodOptionToPurchaseAdditionalSharesTerm
Namespace Prefix: | astc_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Describe the conversion features of preferred stock if preferred stock is convertible. That is, shares of preferred stock into which another convertible security was converted, or shares of preferred stock into which another class of preferred stock was converted. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_PreferredStockConversionBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 + Details
Name: | us-gaap_PreferredStockSharesIssued
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOrSaleOfEquity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Per share or per unit amount of equity securities issued. + References No definition available. + Details
Name: | us-gaap_SharesIssuedPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of new stock issued during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=astc_HcwainwrightcollcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=astc_ThePlacementAgentsWarrantsNo1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=astc_ThePlacementAgentsWarrantsNo2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=astc_ThePlacementAgentsWarrantsNo3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=astc_TheUnderwriterWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=astc_UnderwrittenPublicOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=astc_TheWainwrightAtmAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=astc_ThePublicOfferingSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=astc_TheOctoberRegisteredOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=astc_TheFebruaryRegisteredOfferingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_SeriesDPreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |