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Geographic areas and major customers (Sales to Single Customers Exceeding 10% of Sales) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue, Major Customer [Line Items]
Sales	$ 150,582	$ 128,460	$ 107,398
Customer A [Member]
Revenue, Major Customer [Line Items]
Sales	22,926	19,184	12,278
Customer B [Member]
Revenue, Major Customer [Line Items]
Sales	8,519	7,788	13,468
Customer C [Member]
Revenue, Major Customer [Line Items]
Sales	$ 5,965	$ 7,689	$ 13,328

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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