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FAIR VALUE MEASUREMENTS (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jun. 30, 2018 | Jul. 01, 2017 | Dec. 30, 2017
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | $ 59,516,997 |  | $ 59,516,997 |  | $ 71,234,230
Payments to Acquire Equity Method Investments |  |  | $ 0 |  |
Noncash or Part Noncash Acquisition, Interest Acquired |  |  | 15.00% |  |
Gain on investments | 0 | $ 0 | $ 2,849,816 | $ 274,000 |
Level 1 |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 26,124,652 |  | 26,124,652 |  | 32,254,096
Level 2 |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 27,683,529 |  | 27,683,529 |  | 36,980,134
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) |  |  | 3,900,000 |  |
Financial Instruments, Owned, at Fair Value | 5,708,816 |  | 5,708,816 |  | 2,000,000
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  |  | (191,184) |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  |  | 0 |  |
Equity Securities [Member] |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 3,900,000 |  | 3,900,000 |  |
Payments to Acquire an Equity Investment | 1,000,000 |  | 1,000,000 |  |
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, (Sales), Issuances, (Settlements) |  |  | 3,900,000 |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 |  |  | 1,949,816 |  |
Financial Instruments, Owned, at Fair Value | 5,708,816 |  | 5,708,816 |  |
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  |  | (141,000) |  |
Warrant [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 0 |  | 0 |  | 2,000,000
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss) |  |  | (50,184) |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  |  | (1,949,816) |  |
Certificates of Deposit [Member] |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value |  |  |  |  | 200,740
Certificates of Deposit [Member] | Level 2 |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value |  |  |  |  | 200,740
Certificates of Deposit [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value |  |  |  |  | 0
Corporate Debt Securities [Member] |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 7,262,615 |  | 7,262,615 |  | 8,980,906
Corporate Debt Securities [Member] | Level 2 |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 7,262,615 |  | 7,262,615 |  | 8,980,906
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 0 |  | 0 |  | 0
U.S. Government Securities |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 23,418,514 |  | 23,418,514 |  | 34,725,811
U.S. Government Securities | Level 1 |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 2,997,600 |  | 2,997,600 |  | 6,927,323
U.S. Government Securities | Level 2 |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 20,420,914 |  | 20,420,914 |  | 27,798,488
U.S. Government Securities | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 0 |  | 0 |  | 0
Cash and Cash Equivalents |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 22,742,575 |  | 22,742,575 |  | 24,848,227
Cash and Cash Equivalents | Level 1 |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 22,742,575 |  | 22,742,575 |  | 24,848,227
Cash and Cash Equivalents | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 0 |  | 0 |  | 0
Equity Securities [Member] |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 5,708,816 |  | 5,708,816 |  |
Gain on investments |  |  | 2,900,000 |  |
Equity Securities [Member] | Level 1 |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 0 |  | 0 |  |
Equity Securities [Member] | Level 2 |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 0 |  | 0 |  |
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 5,708,816 |  | 5,708,816 |  |
GCS Holdings |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 384,477 |  | 384,477 |  | 478,546
GCS Holdings | Level 1 |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 384,477 |  | 384,477 |  | 478,546
GCS Holdings | Level 2 |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | 0 |  | 0 |  |
GCS Holdings | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value | $ 0 |  | $ 0 |  | 0
Warrant [Member] |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value |  |  |  |  | 2,000,000
Warrant [Member] | Level 1 |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value |  |  |  |  | 0
Warrant [Member] | Level 2 |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value |  |  |  |  | 0
Warrant [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Fair Value Measurements [Line Items] |  |  |  |  |
Financial Instruments, Owned, at Fair Value |  |  |  |  | $ 2,000,000

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