Note 5 - Property, Plant and Equipment - Major Classes of Property, Plant and Equipment (Details) - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Property, plant and equipment, gross		$ 37,376,110	$ 35,522,568
Less: Accumulated depreciation and amortization		(6,973,552)	(6,683,111)
Property, plant and equipment, net		30,402,558	28,839,457
Depreciation and amortization	[1]	1,141,161	867,277
Land [Member]
Property, plant and equipment, gross		6,929,000	6,929,000
Building [Member]
Property, plant and equipment, gross		15,920,925	15,917,925
Building Improvements [Member]
Property, plant and equipment, gross		6,603,121	5,805,045
Machinery and Equipment [Member]
Property, plant and equipment, gross		3,385,357	3,246,877
Furniture and Fixtures [Member]
Property, plant and equipment, gross		611,190	563,959
Computer Equipment [Member]
Property, plant and equipment, gross		487,007	587,147
Software Development [Member]
Property, plant and equipment, gross		441,376	427,441
Transportation Equipment [Member]
Property, plant and equipment, gross		65,995	65,994
Lab Equipment [Member]
Property, plant and equipment, gross		1,985,179	1,979,180
Construction in Progress [Member]
Property, plant and equipment, gross		$ 946,960

[1] Includes amortization expense of $115,800 and $45,645 for the year ending December 31, 2018 and the year ended December 31, 2017, respectively. Such amortization expense relates to other capitalized and intangibles assets.