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Note 17 - Quarterly Consolidated Financial Data (Unaudited) - Quarterly Consolidated Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Net revenues | $ 14,875 | $ 14,443 | $ 13,275 | $ 11,230 | $ 13,614 | $ 14,632 | $ 14,352 | $ 18,062 | $ 53,823 | $ 60,660
Gross margin | 6,720 | 6,450 | 6,067 | 4,867 | 6,465 | 7,205 | 6,719 | 8,836 | 24,104 | 29,225
Earnings (loss) before income tax expense (benefit) | (454) | 433 | 183 | (1,393) | 648 | 794 | (300) | 1,462 | (1,231) | 2,604
Income tax expense (benefit) | (74) | (25) | 13 | (250) | (76) | 147 | (113) | 324 | (336) | 282
Net earnings (loss) | $ (380) | $ 458 | $ 170 | $ (1,143) | $ 724 | $ 647 | $ (187) | $ 1,138 | $ (895) | $ 2,322
Net earnings (loss) per common share – basic (in dollars per share) | $ (0.04) | $ 0.04 | $ 0.02 | $ (0.11) | $ 0.07 | $ 0.06 | $ (0.02) | $ 0.11 | $ (0.09) | $ 0.22
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
Net earnings (loss) per common share – diluted (in dollars per share) | $ (0.04) | $ 0.04 | $ 0.02 | $ (0.11) | $ 0.07 | $ 0.06 | $ (0.02) | $ 0.11 | $ (0.09) | $ 0.22
Weighted average common shares 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
[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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