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Note 8 - Geographic Segment Data - Financial Information by Geographic Area (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Sales to outside customers	$ 11,525,469	$ 13,225,954	$ 41,489,372	$ 41,397,288
Total Assets	40,059,606		40,059,606		$ 39,984,038
UNITED STATES
Sales to outside customers	7,736,000	9,039,000	29,549,000	30,165,000
Total Assets	25,644,000		25,644,000		27,784,000
Europe [Member]
Sales to outside customers	1,158,000	1,261,000	3,795,000	3,125,000
Total Assets	3,043,000		3,043,000		2,989,000
MEXICO
Sales to outside customers	2,396,000	2,627,000	6,959,000	6,605,000
Total Assets	10,283,000		10,283,000		8,288,000
UNITED KINGDOM
Sales to outside customers	236,000	$ 299,000	1,186,000	$ 1,502,000
Total Assets	$ 1,089,000		$ 1,089,000		$ 923,000

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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