Note 15 - Segment Information (Details) - Revenue by Country - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Note 15 - Segment Information (Details) - Revenue by Country [Line Items]
Revenue by location	$ 1,358,800	$ 1,406,700	$ 2,829,900	$ 2,746,900
UNITED STATES
Note 15 - Segment Information (Details) - Revenue by Country [Line Items]
Revenue by location	616,800	593,200	1,368,300	1,144,200
BRAZIL
Note 15 - Segment Information (Details) - Revenue by Country [Line Items]
Revenue by location	246,100	198,300	415,600	355,400
Other Countries [Member]
Note 15 - Segment Information (Details) - Revenue by Country [Line Items]
Revenue by location	$ 495,900	$ 615,200	$ 1,046,000	$ 1,247,300