Note 6 - Other Comprehensive Income - Accumulated Other Comprehensive Loss Balances (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Balance	$ 10,444,260	$ 11,977,577
Balance	6,255,729	10,444,260
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(5,365,364)	(5,593,878)
Accumulated Other Comprehensive Loss, Current period change	(684,983)	228,514
Balance	(6,050,347)	(5,365,364)
AOCI Attributable to Parent [Member]
Balance	(5,365,364)	(5,593,878)
Accumulated Other Comprehensive Loss, Current period change	(684,983)	228,514
Balance	$ (6,050,347)	$ (5,365,364)

Amount after tax and reclassification adjustments of other comprehensive income (loss).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669619-108580

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1B
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669625-108580

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