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Note 15 - Share-based Compensation (Details Textual) - USD ($) |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 15, 2022 | Nov. 01, 2021 | Sep. 01, 2021 | Mar. 16, 2021 | Mar. 10, 2020 | Oct. 04, 2019 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 08, 2020 | Oct. 02, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  |  |  |  | 7,817,040 |  | 7,817,040 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  |  |  | 322,000 | 275,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |  |  |
Dividends, Total |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  |  |  |  |  |  |  | $ 1,290,000 |  | 1,290,000 |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  | $ 355,000 | $ 446,000 | $ 1,650,000 | $ 956,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) |  |  |  |  |  |  |  | $ 3.26 |  | $ 3.26 |  | $ 3.02 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term (Year) |  |  |  |  |  |  |  |  |  | 3 years 6 months 10 days |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value |  |  |  |  |  |  |  | $ 1,585,000 |  | $ 1,585,000 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value |  |  |  |  |  |  |  | $ 1,584,000 |  | $ 1,584,000 |  |  |  |  |  |
Share Price (in dollars per share) |  |  |  |  |  |  |  | $ 3.25 |  | $ 3.25 |  |  |  |  |  | $ 5.98
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value |  |  |  |  |  |  |  |  |  | $ 191,000 | 455,000 |  |  |  |  |
Gross Proceeds from Stock Options Exercised |  |  |  |  |  |  |  |  |  | $ 253,000 | 170,000 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.31 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.03 |  |
Common Stock Award [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  |  |  |  |  |  | 4,515,315 |  | 4,515,315 |  |  |  |  |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  |  |  |  | 1 year 4 months 24 days |  |  |  |  |  |
Share-Based Payment Arrangement, Option [Member] | Employees, Directors, and Consultants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  | $ 162,000 | 84,000 | $ 434,000 | $ 206,000 |  |  |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |
Performance Shares [Member] | Key Executive [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  |  |  | 800,000 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  |  |  | 7 years |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  |  |  |  |  | 1 year 4 months 24 days |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  | 193,000 | $ 363,000 | $ 1,216,000 | $ 750,000 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  |  |  |  | 260,800 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  |  |  |  |  |  |  |  | 270,262 |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  |  |  |  |  |  | $ 1,204 |  | $ 1,204 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Employee [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture |  |  |  |  |  |  |  |  |  | $ 348,000 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares) |  |  |  |  |  |  |  |  |  | 100,800 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Board of Directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 30,000 |  | 17,500 | 27,883 | 30,000 |  |  |  |  |  |  |  |  |  |  |
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture | $ 407,000 |  | $ 184,000 | $ 1,100,000 | $ 425,000 |  |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  |  |  |  |  |  |  |  |  |  |  | 3 years | 3 years |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  |  |  |  |  |  | 145,950 | 81,270 |  |  |
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture |  |  |  |  |  |  |  |  |  |  |  | $ 989,000 | $ 258,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  |  |  |  |  | 5,000 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Non-employee Advisors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Granted, Value, Share-based Payment Arrangement, before Forfeiture |  | $ 51,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2015 Equity Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  | 5,000,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Proposed Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |
2015 Equity Plan [Member] | Options and RSUs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Equity Instruments Other than Options, Outstanding, Number (in shares) |  |  |  |  |  |  |  | 3,291,725 |  | 3,291,725 |  |  |  |  |  |
2005 Equity Plan [Member] | Options and RSUs [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options and Equity Instruments Other than Options, Outstanding, Number (in shares) |  |  |  |  |  |  |  | 10,000 |  | 10,000 |  |  |  |  |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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