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Note 8 - Geographic Segment Data - Financial Information by Geographic Area (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Sales to outside customers	$ 8,537,475	$ 11,525,469	$ 33,480,704	$ 41,489,372
Assets	32,897,091		32,897,091		$ 38,760,834
UNITED STATES
Sales to outside customers	5,126,000	7,735,000	22,980,000	29,549,000
Assets	17,841,000		17,841,000		25,354,000
Europe [Member]
Sales to outside customers	1,002,000	1,158,000	3,361,000	3,795,000
Assets	2,805,000		2,805,000		3,052,000
MEXICO
Sales to outside customers	2,245,000	2,396,000	6,348,000	6,959,000
Assets	11,260,000		11,260,000		9,476,000
UNITED KINGDOM
Sales to outside customers	164,000	$ 236,000	792,000	$ 1,186,000
Assets	$ 991,000		$ 991,000		$ 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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 280
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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