Note 12 - Geographical Sales (Tables)

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

Geographical distribution of sales consisted of the following for the years ended December 31, 2018 and 2017:

	2018		2017
Geographical Areas
North America	$	54,126,312	$	49,765,102
Europe		-		3,456,045
China		11,331,108		14,598,858
Australia		11,075,268		25,895,686
Asia*		11,817,196		12,281,116
Hong Kong		2,922		471,279
Other countries		292,398		26,046
	$	88,645,204	$	106,494,132

 * excluding China and Hong Kong