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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue recognition (Details) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Estimated contractual allowance |  |  |  |  |  |  |  |  | $ 3,586,726 | $ 3,896,341 |
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% |  |
Sales, net | $ 12,629,000 | $ 11,640,000 | $ 9,596,000 | $ 7,932,000 | $ 8,264,000 | $ 9,863,000 | $ 7,475,000 | $ 7,673,000 | $ 41,797,179 | $ 33,274,702 | $ 34,493,838
Income tax at the federal statutory rate (as a percent) |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 35.00%
Provision (benefit) for income taxes | $ 1,000 | $ 4,000 | $ 3,000 |  | $ (13,000) |  |  |  | $ 7,875 | $ (13,318) | $ (187,608)
Minimum |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Period of revenue recognition |  |  |  |  |  |  |  |  | 30 days |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Period of revenue recognition |  |  |  |  |  |  |  |  | 60 days |  |
Syringes |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | $ 35,638,427 | 28,266,046 | 31,009,718
Blood Collection Products |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | 2,715,697 | 1,422,842 | 1,145,999
Easy Point Needles |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | 2,979,005 | 3,413,409 | 2,065,777
Other Products |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | 464,050 | 172,405 | 272,344
U.S. |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | 31,897,924 | 28,646,574 | 27,015,712
U.S. | Syringes |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | 26,722,414 | 23,803,483 | 23,794,258
U.S. | Blood Collection Products |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | 2,130,767 | 1,365,936 | 1,098,667
U.S. | Easy Point Needles |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | 2,970,374 | 3,401,389 | 2,065,777
U.S. | Other Products |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | 74,369 | 75,766 | 57,010
North and South America sales (excluding U.S.) |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | 8,248,990 | 3,597,444 | 6,380,745
North and South America sales (excluding U.S.) | Syringes |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | 7,863,796 | 3,521,823 | 6,182,952
North and South America sales (excluding U.S.) | Blood Collection Products |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | 6,313 | 8,805 | 3,859
North and South America sales (excluding U.S.) | Easy Point Needles |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | 7,996 | 252 |
North and South America sales (excluding U.S.) | Other Products |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | 370,885 | 66,564 | 193,934
Other international sales |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | 1,650,265 | 1,030,684 | 1,097,381
Other international sales | Syringes |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | 1,052,217 | 940,740 | 1,032,508
Other international sales | Blood Collection Products |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | 578,617 | 48,101 | 43,473
Other international sales | Easy Point Needles |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | 635 | 11,768 |
Other international sales | Other Products |  |  |  |  |  |  |  |  |  |  |
Revenue recognition |  |  |  |  |  |  |  |  |  |  |
Sales, net |  |  |  |  |  |  |  |  | $ 18,796 | $ 30,075 | $ 21,400

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