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INVESTMENT SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Held-to-maturity Securities |
|  | December 31, 2017 |
|  | Amortized cost, as adjusted |  |  | Gross unrealized holding gains |  |  | Gross unrealized holding losses |  |  | Estimated fair value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |
Obligations of domestic governmental agencies (maturing between January 2018 and November 2018) (held-to-maturity) |  | $ | 27,998,810 |  |  | $ | -- |  |  | $ | 35,235 |  |  | $ | 27,963,575 |
Total short-term investment securities |  | $ | 27,998,810 |  |  | $ | -- |  |  | $ | 35,235 |  |  | $ | 27,963,575 |
|  | December 31, 2016 |
|  | Amortized cost, as adjusted |  |  | Gross unrealized holding gains |  |  | Gross unrealized holding losses |  |  | Estimated fair value |
Short-term investments: |  |  |  |  |  |  |  |  |  |  |  |
Obligations of domestic governmental agencies (maturing between February 2017 and September 2017) (held-to-maturity) |  | $ | 19,853,860 |  |  | $ | 3,270 |  |  | $ | 2,492 |  |  | $ | 19,854,638 |
Total short-term investment securities |  | $ | 19,853,860 |  |  | $ | 3,270 |  |  | $ | 2,492 |  |  | $ | 19,854,638 |

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- Definition Tabular disclosure of all investments in certain debt and equity securities for which the entity has the positive intent and ability to hold until maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6435544&loc=d3e41834-113960 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5086-111524 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 + Details
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