Note 8 - Income Taxes - Deferred Income Tax Assets and Liabilities (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Deferred income tax assets:
Capitalized inventory costs	$ 198,616	$ 265,454
Warrants and share-based compensation	29,047	44,151
Accrued expenses, reserves, and other	44,075	65,631
Total deferred income tax assets	271,738	375,236
Deferred income tax liabilities:
Property and equipment depreciation	1,008,485	1,728,265
Goodwill and other intangible assets amortization	155,175	227,767
Transition tax on deemed repatriation of foreign earnings	473,298
Total deferred income tax liabilities	$ 1,636,958	$ 1,956,032