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Note 9 - Stock-based Compensation and Incentive Plans - Nonvested Restricted Stock Units Activity (Details) - Phantom Stock Plan [Member] - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Series A Warrants [Member] |  |
Balance (in dollars per share) | $ 0 | $ 1.00
Balance (in shares) | 0 | 7,650
Vested (in dollars per share) |  | $ 1.00
Vested (in shares) |  | (7,650)
Series B Warrants [Member] |  |
Balance (in dollars per share) | $ 0 | $ 2.94
Balance (in shares) | 0 | 8,269
Vested (in dollars per share) |  | $ 2.94
Vested (in shares) |  | (8,269)
Time Based Restricted Stock Awards [Member] |  |
Balance (in dollars per share) | $ 0 | $ 226.50
Balance (in shares) | 0 | 4,517
Vested (in dollars per share) |  | $ 226.50
Vested (in shares) |  | (4,517)

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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Balance Type: | na
Period Type: | instant

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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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Period Type: | instant

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Details
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- Details
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- Details
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