Note 15 - Revenue by Product Group, by Significant Customer and by Geographic Region; Geographic Information (Details) - Net Tangible Long-lived Assets by Principal Geographic Areas (USD $)	Dec. 31, 2014	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Net tangible long-lived assets	$ 31,668,883	$ 32,938,711
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net tangible long-lived assets	31,058,617	31,999,468
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net tangible long-lived assets	$ 610,266	$ 939,243