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Note 2 - Summary of Significant Accounting Policies - Weighted Average Common Shares (Details) - shares | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | [1] | Sep. 30, 2020 | [2] | Jun. 30, 2020 | [3] | Mar. 31, 2020 | [4] | Dec. 31, 2019 | Sep. 30, 2019 | [5] | Jun. 30, 2019 | [6] | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Weighted average common shares outstanding–basic (in shares) | 10,282,903 | 10,269,995 | 10,252,490 | 10,220,853 | 10,274,980 | 10,421,383 | 10,411,276 | 10,385,017 | 10,256,560 | 10,373,164
Unvested shares of restricted stock and employee stock options (in shares) |  |  |  |  |  |  |  |  |  | 18,811
Weighted average common shares and common share equivalents outstanding – diluted (in shares) | 10,282,903 | 10,287,562 | 10,258,917 | 10,220,853 | 10,298,535 | 10,429,536 | 10,411,276 | 10,414,330 | 10,256,560 | 10,391,975
Average number of potentially dilutive securities excluded from calculation (in shares) |  |  |  |  |  |  |  |  | 717,015 | 523,485
[1] | The quarter ended December 31, 2020 includes $1,078 of restructuring and other charges which are discussed in Note 3.
[2] | The quarter ended September 30, 2020 includes $161 of restructuring and other charges which are discussed in Note 3.
[3] | The quarter ended June 30, 2020 includes $38 of restructuring and other charges which are discussed in Note 3.
[4] | The quarter ended March 31, 2020 includes $8 of restructuring and other charges which are discussed in Note 3.
[5] | The quarter ended September 30, 2019 includes $17 of restructuring and other charges which are discussed in Note 3.
[6] | The quarter ended June 30, 2019 includes $223 of restructuring and other charges which are discussed in Note 3.

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1707-109256 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 28A -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1500-109256 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1757-109256 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1505-109256 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121326447&loc=d3e1448-109256 + Details
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