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Significant Customers (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Significant customers
Revenue	$ 25,205,000	$ 28,967,000
Sales Revenue, Net | Customer Concentration Risk
Significant customers
Revenue	$ 0	$ 0
Sales Revenue, Net | Customer Concentration Risk | Customers
Significant customers
Concentration risk, percentage	10.00%	10.00%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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