Note 9 - Sales by Product and by Geographical Region (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Domestic [Member] | Instruments [Member]
Total revenue	$ 190,504	$ 153,325	$ 852,149	$ 602,290
Domestic [Member] | Handpieces [Member]
Total revenue	695,761	673,062	1,753,685	1,105,124
Domestic [Member] | Other Products [Member]
Total revenue	20,652	15,229	34,126	1,762
Domestic [Member]
Total revenue	906,917	841,616	2,639,960	1,709,176
International [Member] | Instruments [Member]
Total revenue	535,335	136,430	1,559,050	814,044
International [Member] | Handpieces [Member]
Total revenue	882,135	757,079	1,537,124	1,971,531
International [Member] | Other Products [Member]
Total revenue	47,323	31,635	100,062	42,212
International [Member]
Total revenue	1,464,793	925,144	3,196,236	2,827,787
Total revenue	$ 2,371,710	$ 1,766,759	$ 5,836,196	$ 4,536,963