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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, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net sales	$ 45,153	$ 43,299	$ 42,644	$ 48,277	$ 50,260	$ 49,394	$ 51,399	$ 47,328	$ 179,373	$ 198,381	$ 190,455
Gross profit	11,384	10,528	9,949	12,823	13,770	13,321	14,371	12,497	$ 44,684	$ 53,959	$ 48,308
Net income	$ 4,172	$ 2,988	$ 2,318	$ 3,891	$ 5,777	$ 5,641	$ 4,598	$ 3,734
Basic net income per share (in dollars per share)	$ 0.56	$ 0.0	$ 0.31	$ 0.52	$ 0.78	$ 0.76	$ 0.62	$ 0.0	$ 1.79	$ 2.66	$ 1.95
Diluted net income per share (in dollars per share)	$ 0.55	$ 0.0	$ 0.31	$ 0.52	$ 0.77	$ 0.75	$ 0.62	$ 0.0	$ 1.77	$ 2.63	$ 1.93

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