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Note 18 - Quarterly Financial Information (Unaudited) - Summarized Quarterly 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	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net sales	$ 50,260	$ 49,394	$ 51,399	$ 47,328	$ 50,697	$ 47,808	$ 49,019	$ 42,931	$ 198,381	$ 190,455	$ 147,843
Gross profit	13,770	13,321	14,371	12,497	12,706	12,431	12,986	10,185	$ 53,959	$ 48,308	$ 35,487
Net income	$ 5,777	$ 5,641	$ 4,598	$ 3,734	$ 4,410	$ 4,134	$ 3,990	$ 1,777
Basic net income per share (in dollars per share)	$ 0.78	$ 0.76	$ 0.62	$ 0.50	$ 0.60	$ 0.56	$ 0.54	$ 0.24	$ 2.66	$ 1.95	$ 1.27
Diluted net income per share (in dollars per share)	$ 0.76	$ 0.75	$ 0.62	$ 0.50	$ 0.59	$ 0.56	$ 0.54	$ 0.24	$ 2.63	$ 1.93	$ 1.26

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