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Note 12 - Segment and Geographic Data - Summary of Operations by Geographic Area (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Product sales, net $ 2,428,498 $ 2,523,750 $ 4,234,103 $ 6,212,738
Product sales, net 2,428,498 2,523,750 4,234,103 6,212,738
Domestic [Member]        
Product sales, net 1,192,857 1,424,142 2,111,287 3,139,213
Product sales, net 1,192,857 1,424,142 2,111,287 3,139,213
Domestic [Member] | Devices [Member]        
Product sales, net 11,505 219,648 132,553 405,293
Product sales, net 11,505 219,648 132,553 405,293
Domestic [Member] | Handpieces [Member]        
Product sales, net 1,158,975 1,182,985 1,927,506 2,693,471
Product sales, net 1,158,975 1,182,985 1,927,506 2,693,471
Domestic [Member] | Manufactured Product, Other [Member]        
Product sales, net 22,377 21,509 51,228 40,449
Product sales, net 22,377 21,509 51,228 40,449
Rest of World [Member]        
Product sales, net 1,235,641 743,208 2,122,816 1,715,325
Product sales, net 1,235,641 743,208 2,122,816 1,715,325
Rest of World [Member] | Devices [Member]        
Product sales, net 367,450 353,805 652,518 712,475
Product sales, net 367,450 353,805 652,518 712,475
Rest of World [Member] | Handpieces [Member]        
Product sales, net 839,194 362,437 1,418,021 945,786
Product sales, net 839,194 362,437 1,418,021 945,786
Rest of World [Member] | Manufactured Product, Other [Member]        
Product sales, net 28,997 26,966 52,277 57,064
Product sales, net 28,997 26,966 52,277 57,064
CHINA        
Product sales, net 356,400 1,358,200
Product sales, net 356,400 1,358,200
CHINA | Devices [Member]        
Product sales, net 1,000,000
Product sales, net 1,000,000
CHINA | Handpieces [Member]        
Product sales, net 356,400 356,400
Product sales, net 356,400 356,400
CHINA | Manufactured Product, Other [Member]        
Product sales, net 1,800
Product sales, net $ 1,800