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 |