Note 16 - Quarterly Consolidated Financial Data (Unaudited) - Quarterly Consolidated Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	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.