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Note 16 - Quarterly Consolidated Financial Data (Unaudited) - Quarterly Consolidated Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | [1] | Sep. 30, 2018 | [2] | Jun. 30, 2018 | [3],[4] | Mar. 31, 2018 | [5] | Dec. 31, 2019 | Dec. 31, 2018
Net revenues | $ 13,614 | $ 14,632 | $ 14,352 | $ 18,062 | $ 18,435 | $ 20,160 | $ 21,097 | $ 18,871 | $ 60,660 | $ 78,563
Gross margin | 6,465 | 7,205 | 6,719 | 8,836 | 9,004 | 10,092 | 10,910 | 9,395 | 29,225 | 39,401
Earnings (loss) before income tax expense | 648 | 794 | (300) | 1,462 | (497) | 162 | 4,396 | 982 | 2,604 | 5,043
Income tax expense (benefit) | (76) | 147 | (113) | 324 | 295 | 728 | 382 | 601 | 282 | 2,006
Net earnings (loss) | $ 724 | $ 647 | $ (187) | $ 1,138 | $ (792) | $ (566) | $ 4,014 | $ 381 | $ 2,322 | $ 3,037
Net earnings (loss) per common share – basic (in dollars per share) | $ 0.07 | $ 0.06 | $ (0.02) | $ 0.11 | $ (0.08) | $ (0.05) | $ 0.39 | $ 0.04 | $ 0.22 | $ 0.29
Weighted average common shares outstanding – basic (in shares) | 10,274,980 | 10,421,383 | 10,411,276 | 10,385,017 | 10,367,132 | 10,355,673 | 10,342,674 | 10,326,309 | 10,373,164 | 10,347,947
Net earnings (loss) per common share – diluted (in dollars per share) | $ 0.07 | $ 0.06 | $ (0.02) | $ 0.11 | $ (0.08) | $ (0.05) | $ 0.39 | $ 0.04 | $ 0.22 | $ 0.29
Weighted average common shares outstanding – diluted (in shares) | 10,298,535 | 10,429,536 | 10,411,276 | 10,414,330 | 10,367,132 | 10,355,673 | 10,370,318 | 10,365,306 | 10,391,975 | 10,382,194
[1] | The quarter ended December 31, 2018 includes a $2,828 increase in the fair value of contingent consideration, which was not deductible for tax purposes.
[2] | The quarter ended September 30, 2018 includes $3,057 increase in the fair value of contingent consideration, which was not deductible for tax purposes.
[3] | The quarter ended June 30, 2018 includes a $710 reduction in the fair value of contingent consideration, which was not taxable.
[4] | The quarter ended June 30, 2018 includes the reversal of certain adjustments originally recorded in the quarter ended December 31, 2017 which were related to tax legislation enacted in December 2017, as discussed in Note 10.
[5] | The quarter ended March 31, 2018 includes a $1,726 increase in the fair value of contingent consideration, which was not deductible for tax purposes.

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