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Note 9 - Stockholders' Equity - Warrants (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Outstanding, number of shares (in shares) | 6,369,396 | 1,074,171 | 1,074,171 |
Outstanding, weighted average exercise price (in dollars per share) | $ 1.97 | $ 0.50 | $ 0.50 |
Outstanding, weighted average remaining life (Year) | 2 years 3 days | 2 years 11 months 23 days | 2 years 5 months 23 days | 4 years 1 month 6 days
Outstanding, intrinsic value | $ 1,796,413 | $ 2,430,184 | $ 2,784,117 | $ 956,012
Issued, number of shares (in shares) | 0 | 6,459,000 |  |
Issued, weighted average exercise price (in dollars per share) |  | $ 2.01 |  |
Exercised, number of shares (in shares) | (2,004,926) | (1,081,475) |  |
Exercised, weighted average exercise price (in dollars per share) | $ 1.57 | $ 0.88 |  |
Expired or cancelled (in shares) | 0 | 0 |  |
Expired or cancelled, weighted average exercise price (in dollars per share) | $ 0 | $ 0 |  |
Issued, weighted average remaining life (Year) |  | 3 years |  |
Outstanding , number of shares (in shares) | 4,364,470 | 6,451,696 | 6,369,396 | 1,074,171
Outstanding , weighted average exercise price (in dollars per share) | $ 2.15 | $ 1.95 | $ 1.97 | $ 0.50

X
- Definition The number of warrants or rights exercised during period. + References No definition available. + Details
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Namespace Prefix: | mlss_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share of warrants or rights exercised during period. + References No definition available. + Details
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Namespace Prefix: | mlss_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of warrants or rights expired or cancelled during period. + References No definition available. + Details
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Namespace Prefix: | mlss_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share of warrants or rights expired or cancelled during period. + References No definition available. + Details
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Namespace Prefix: | mlss_
Data Type: | dtr-types:perShareItemType
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X
- Definition The number of warrants or rights issued during period. + References No definition available. + Details
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Namespace Prefix: | mlss_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Exercise price per share of warrants or rights issued during period. + References No definition available. + Details
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Namespace Prefix: | mlss_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the weighted average remaining term of warrants and rights issued. + References No definition available. + Details
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Namespace Prefix: | mlss_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the weighted average remaining term of warrants and rights outstanding, + References No definition available. + Details
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Namespace Prefix: | mlss_
Data Type: | xbrli:durationItemType
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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 http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References No definition available. + Details
Name: | us-gaap_WarrantsAndRightsOutstanding
Namespace Prefix: | us-gaap_
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