Note 8 - Investment in Unconsolidated Affiliate - Summarized Financial Information (Unaudited) of Milestone China (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenue from Contract with Customer, Including Assessed Tax	$ 2,428,498	$ 2,523,750	$ 4,234,103	$ 6,212,738
Cost of goods sold	1,021,573	873,586	1,584,250	2,275,871
Gross Profit	1,406,925	1,650,164	2,649,853	3,936,867
Net Losses	(1,350,001)	(1,540,509)	(3,325,371)	(2,118,501)
Milestone China [Member]
Current assets	13,700,622		13,700,622		$ 13,127,422
Non-current assets	3,258,274		3,258,274		3,213,520
Total assets:	16,958,896		16,958,896		16,340,942
Current liabilities	20,633,618		20,633,618		18,468,937
Stockholders' deficit	(3,674,722)		(3,674,722)		(2,127,995)
Total liabilities and stockholders’ deficit	16,958,896		16,958,896		$ 16,340,942
Revenue from Contract with Customer, Including Assessed Tax	1,328,079	322,226	2,085,034	1,165,552
Cost of goods sold	650,840	422,789	1,098,452	889,204
Gross Profit	677,239	(100,563)	986,582	276,348
Other Expenses	(1,119,440)	(643,570)	(2,371,652)	(1,601,666)
Net Losses	$ (442,201)	$ (744,133)	$ (1,385,070)	$ (1,325,318)