Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts - Schedule of Valuation and Qualifying Accounts (Details)

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Schedule II - Valuation and Qualifying Accounts - Schedule of Valuation and Qualifying Accounts (Details) - Valuation Allowance, Deferred Tax Asset [Member] - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Balance at beginning of period $ 4,839,000 $ 3,892,000
Charged to costs and expenses 784,000 947,000
Charged to other accounts
Deductions
Balance at end of period $ 4,623,000 $ 4,839,000