Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Significant Customers and Geographical Information - Sales by Product and by Geographical Region (Details)

v3.7.0.1
Note 10 - Significant Customers and Geographical Information - Sales by Product and by Geographical Region (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Product sales, net $ 3,688,988 $ 3,569,374
Sales Revenue, Goods, Net [Member] | Geographic Concentration Risk [Member]    
Product sales, net $ 3,688,988 $ 3,569,373
Product sales, percent 100.00% 100.00%
Domestic [Member] | Sales Revenue, Goods, Net [Member] | Product Concentration Risk [Member]    
Product sales, net $ 1,715,071 $ 1,684,167
Product sales, percent 100.00% 100.00%
Domestic [Member] | Sales Revenue, Goods, Net [Member] | Geographic Concentration Risk [Member]    
Product sales, net $ 1,715,071 $ 1,684,167
Product sales, percent 46.50% 47.20%
Domestic [Member] | Instruments [Member] | Sales Revenue, Goods, Net [Member] | Product Concentration Risk [Member]    
Product sales, net $ 185,645 $ 661,645
Product sales, percent 10.80% 39.30%
Domestic [Member] | Handpieces [Member] | Sales Revenue, Goods, Net [Member] | Product Concentration Risk [Member]    
Product sales, net $ 1,510,486 $ 988,143
Product sales, percent 88.10% 58.70%
Domestic [Member] | Other Products [Member] | Sales Revenue, Goods, Net [Member] | Product Concentration Risk [Member]    
Product sales, net $ 18,941 $ 34,379
Product sales, percent 1.10% 2.00%
International [Member] | Sales Revenue, Goods, Net [Member] | Product Concentration Risk [Member]    
Product sales, net $ 1,973,917 $ 1,885,206
Product sales, percent 100.00% 100.00%
International [Member] | Sales Revenue, Goods, Net [Member] | Geographic Concentration Risk [Member]    
Product sales, net $ 1,973,917 $ 1,885,206
Product sales, percent 53.50% 52.80%
International [Member] | Instruments [Member] | Sales Revenue, Goods, Net [Member] | Product Concentration Risk [Member]    
Product sales, net $ 1,358,670 $ 1,268,156
Product sales, percent 68.80% 67.30%
International [Member] | Handpieces [Member] | Sales Revenue, Goods, Net [Member] | Product Concentration Risk [Member]    
Product sales, net $ 583,349 $ 584,708
Product sales, percent 29.60% 31.00%
International [Member] | Other Products [Member] | Sales Revenue, Goods, Net [Member] | Product Concentration Risk [Member]    
Product sales, net $ 31,898 $ 32,342
Product sales, percent 1.60% 1.70%