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Fair Value (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Assets
Short-term Investments	$ 3,163,000	$ 3,951,000
Investments in marketable equity securities, at fair value	1,278,000	949,000
Level 1
Assets
Short-term Investments	3,163,000	3,951,000
Investments in marketable equity securities, at fair value	1,278,000	949,000
Level 2
Assets
Short-term Investments	0	0
Investments in marketable equity securities, at fair value	0	0
Level 3
Assets
Short-term Investments	0	0
Investments in marketable equity securities, at fair value	$ 0	$ 0

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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