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INVESTMENT SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract] |
Held-to-maturity Securities [Table Text Block] | The following tables summarize our investment securities at June 30, 2014 and December 31, 2013:
|  | June 30, 2014 |
|  | 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 2015 and June 2015) (held-to-maturity) |  | $ | 7,959,652 |  | $ | 3,533 |  | $ | 156 |  | $ | 7,963,029 |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of domestic governmental agencies (maturing between July 2015 and September 2015) (held-to-maturity) |  | $ | 6,110,309 |  | $ | 368 |  | $ | 1,017 |  | $ | 6,109,660 |
|  | December 31, 2013 |
|  | Amortized cost, as adjusted |  | Gross unrealized holding gains |  | Gross unrealized holding losses |  | Estimated fair value |
Long-term investments: |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of domestic governmental agencies (maturing between January 2015 and April 2015) (held-to-maturity) |  | $ | 4,918,897 |  | $ | — |  | $ | 650 |  | $ | 4,918,247 |

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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=27724398&loc=d3e27290-111563 Reference 2: 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=35738203&loc=d3e5086-111524 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=27724398&loc=d3e27232-111563 Reference 4: 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=27724398&loc=d3e27337-111563 Reference 5: 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=6957658&loc=d3e62557-112803 Reference 6: 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=6957658&loc=d3e62586-112803 Reference 7: 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 8: 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=27724398&loc=d3e27405-111563 + Details
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