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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.