Note 15 - Segment Information (Tables)

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
United States	$	616,800	$	593,200	$	1,368,300	$	1,144,200
Brazil		246,100		198,300		415,600		355,400
Other countries		495,900		615,200		1,046,000		1,247,300
	$	1,358,800	$	1,406,700	$	2,829,900	$	2,746,900