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Note 8 - Geographic Segment Data - Financial Information by Geographic Area (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Sales to outside customers	$ 12,536,389	$ 13,979,177
Sales to outside customers	41,384,086		$ 38,760,834
UNITED STATES
Sales to outside customers	8,760,000	9,738,000
Sales to outside customers	25,151,000		25,354,000
Europe [Member]
Sales to outside customers	1,275,000	1,362,000
Sales to outside customers	3,366,000		3,052,000
MEXICO
Sales to outside customers	2,081,000	2,186,000
Sales to outside customers	11,406,000		9,476,000
UNITED KINGDOM
Sales to outside customers	420,000	$ 693,000
Sales to outside customers	$ 1,461,000		$ 879,000

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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