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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition and Income taxes (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Revenue recognition |  |  |
Estimated contractual allowance | $ 3,896,341 | $ 4,115,628 |
Period for return of incorrect shipments | 10 days |  |
Number of times overstocking returns are limited | item | 2 |  |
Period for return of product due to overstock | 12 months |  |
Maximum percentage of distributor's total purchase for the prior 12-month period | 1.00% |  |
Aggregate dollar amount of net sales to significant customers | $ 33,274,702 | $ 34,493,838 | $ 29,826,636
Income taxes |  |  |
Income tax at the federal statutory rate (as a percent) | 21.00% | 35.00% | 35.00%
Provision (benefit) for income taxes | $ (13,318) | $ (187,608) | $ 1,132
Minimum |  |  |
Revenue recognition |  |  |
Period of revenue recognition | 30 days |  |
Maximum |  |  |
Revenue recognition |  |  |
Period of revenue recognition | 60 days |  |
Syringes |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | $ 28,266,046 | 31,009,718 | 27,737,063
Blood Collection Products |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | 1,422,842 | 1,145,999 | 590,854
Easy Point Needles |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | 3,413,409 | 2,065,777 | 1,339,386
Other Products |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | 172,405 | 272,344 | 159,333
UNITED STATES |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | 28,646,574 | 27,015,712 | 26,308,246
UNITED STATES | Syringes |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | 23,803,483 | 23,794,258 | 24,349,061
UNITED STATES | Blood Collection Products |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | 1,365,936 | 1,098,667 | 571,242
UNITED STATES | Easy Point Needles |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | 3,401,389 | 2,065,777 | 1,339,386
UNITED STATES | Other Products |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | 75,766 | 57,010 | 48,557
North and South America sales (excluding U.S.) |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | 3,597,444 | 6,380,745 | 2,741,518
North and South America sales (excluding U.S.) | Syringes |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | 3,521,823 | 6,182,952 | 2,643,366
North and South America sales (excluding U.S.) | Blood Collection Products |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | 8,805 | 3,859 | 2,778
North and South America sales (excluding U.S.) | Easy Point Needles |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | 252 |  |
North and South America sales (excluding U.S.) | Other Products |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | 66,564 | 193,934 | 95,374
Other international sales |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | 1,030,684 | 1,097,381 | 776,872
Other international sales | Syringes |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | 940,740 | 1,032,508 | 744,636
Other international sales | Blood Collection Products |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | 48,101 | 43,473 | 16,834
Other international sales | Easy Point Needles |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | 11,768 |  |
Other international sales | Other Products |  |  |
Revenue recognition |  |  |
Aggregate dollar amount of net sales to significant customers | $ 30,075 | $ 21,400 | $ 15,402

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