SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES | |||
| Allowance for doubtful accounts | $ 0 | $ 0 | |
| Balance | 109,000 | 50,000 | |
| Provision for prompt payment discount during the year | 807,000 | 540,000 | 189,000 |
| Reduction in prompt payment discount during the year | (745,000) | (481,000) | (139,000) |
| Balance | $ 171,000 | $ 109,000 | $ 50,000 |
| X | ||||||||||
- Definition Amount of customer allowances for prompt payment discounts. No definition available.
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| X | ||||||||||
- Definition Decrease during the period in customer allowances for prompt payment discounts. No definition available.
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| X | ||||||||||
- Definition Increase during the period in customer allowances for prompt payment discounts. No definition available.
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of allowance for credit loss on accounts receivable. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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