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QUARTERLY FINANCIAL DATA (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
QUARTERLY FINANCIAL DATA (Unaudited) |
QUARTERLY FINANCIAL DATA (Unaudited) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Net Income per Common
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | Share
​ |  | Net Sales |  | Gross Profit |  | Net Income |  | Basic |  | Diluted
Quarter ended: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
March 31, 2019 | ​ | $ | 945,991 | ​ | $ | 573,532 | ​ | $ | 261,485 | ​ | $ | 0.48 | ​ | $ | 0.48
June 30, 2019 | ​ |  | 1,104,045 | ​ |  | 661,283 | ​ |  | 292,473 | ​ | $ | 0.54 | ​ | $ | 0.53
September 30, 2019 | ​ |  | 1,133,577 | ​ |  | 673,002 | ​ |  | 298,923 | ​ | $ | 0.55 | ​ | $ | 0.55
December 31, 2019 | ​ |  | 1,017,206 | ​ |  | 610,768 | ​ |  | 254,954 | ​ | $ | 0.47 | ​ | $ | 0.47
​ | ​ | $ | 4,200,819 | ​ | $ | 2,518,585 | ​ | $ | 1,107,835 | ​ | ​ | ​ | ​ | ​ | ​
Quarter ended: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
March 31, 2018 | ​ | $ | 850,921 | ​ | $ | 515,257 | ​ | $ | 216,050 | ​ | $ | 0.38 | ​ | $ | 0.38
June 30, 2018 | ​ |  | 1,015,873 | ​ |  | 620,258 | ​ |  | 270,116 | ​ | $ | 0.48 | ​ | $ | 0.48
September 30, 2018 | ​ |  | 1,016,160 | ​ |  | 607,659 | ​ |  | 267,733 | ​ | $ | 0.48 | ​ | $ | 0.48
December 31, 2018 | ​ |  | 924,229 | ​ |  | 552,201 | ​ |  | 239,105 | ​ | $ | 0.43 | ​ | $ | 0.43
​ | ​ | $ | 3,807,183 | ​ | $ | 2,295,375 | ​ | $ | 993,004 | ​ | ​ | ​ | ​ | ​ | ​

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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