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Note 5 - Property, Plant and Equipment - Major Classes of Property, Plant and Equipment (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Property, plant and equipment, gross $ 20,206,400 $ 20,310,944
Less: Accumulated depreciation and amortization (5,861,476) (5,517,021)
Property, plant and equipment, net 14,344,924 14,793,923
Depreciation and amortization expense (1) [1] 813,657 826,529
Land [Member]    
Property, plant and equipment, gross 2,220,000 2,220,000
Building [Member]    
Property, plant and equipment, gross 6,631,039 6,631,039
Building Improvements [Member]    
Property, plant and equipment, gross 5,615,823 5,615,823
Machinery and Equipment [Member]    
Property, plant and equipment, gross 2,671,333 2,381,964
Furniture and Fixtures [Member]    
Property, plant and equipment, gross 547,144 721,919
Computer Equipment [Member]    
Property, plant and equipment, gross 479,534 701,367
Transportation Equipment [Member]    
Property, plant and equipment, gross 65,994 65,994
Lab Equipment [Member]    
Property, plant and equipment, gross $ 1,975,533 $ 1,972,838
[1] Includes amortization expense of $31,356 and $24,759 for the years ending December 31, 2016 and 2015, respectively. Such amortization expense relates to other capitalized and intangible assets.