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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net sales	$ 37,220	$ 35,684	$ 37,886	$ 37,053	$ 36,507	$ 37,220	$ 37,902	$ 34,503	$ 147,843	$ 146,132	$ 138,850
Gross profit	7,837	8,193	9,941	9,516	8,176	8,452	10,295	7,727	$ 35,487	$ 34,650	$ 37,454
Net income	$ 2,714	$ 1,695	$ 2,630	$ 2,171	$ 1,491	$ 2,669	$ 2,735	$ 1,075
Basic net income per share (in dollars per share)	$ 0.38	$ 0.23	$ 0.36	$ 0.30	$ 0.21	$ 0.37	$ 0.38	$ 0.15	$ 1.27	$ 1.11	$ 1.07
Diluted net income per share (in dollars per share)	$ 0.37	$ 0.23	$ 0.36	$ 0.30	$ 0.20	$ 0.37	$ 0.38	$ 0.15	$ 1.26	$ 1.10	$ 1.05

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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