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Note 8 - Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
|  | Three Months Ended |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Stock options and restricted stock units, net of forfeited |  | $ | 21 |  |  | $ | 57 |  |  | $ | 61 |  |  | $ | 207 |
After-tax effect of stock-based compensation |  | $ | 21 |  |  | $ | 57 |  |  | $ | 61 |  |  | $ | 207 |
Share-based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Weighted- Average |  |  |  |  |
|  | Number |  |  | Weighted- |  |  | Remaining |  |  | Aggregate |
|  | of |  |  | Average |  |  | Contractual |  |  | Intrinsic |
|  | Options |  |  | Exercise Price |  |  | Term |  |  | Value |
Outstanding on January 1, 2021 |  |  | 484,500 |  |  | $ | 3.57 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Expired or forfeited |  |  | (50,000 | ) |  |  | 8.16 |  |  |  |  |  |  |  |  |
Outstanding on September 30, 2021 |  |  | 434,500 |  |  | $ | 3.05 |  |  |  | 3.34 |  |  | $ | 73 |
Exercisable on September 30, 2021 |  |  | 434,500 |  |  | $ | 3.05 |  |  |  | 3.34 |  |  | $ | 73 |
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |
|  |  |  |  |  | Weighted Average |
|  |  |  |  |  | Grant Date |
|  | Shares |  |  | Fair Value |
Unvested restricted stock units at January 1, 2021 |  |  | 100,005 |  |  | $ | 4.08 |
Granted |  |  | — |  |  |  | — |
Forfeited |  |  | (5,000 | ) |  |  | 0.97 |
Vested |  |  | (50,002 | ) |  |  | 1.50 |
Unvested restricted stock units at September 30, 2021 |  |  | 45,003 |  |  | $ | 7.29 |

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=122041274&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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