Change in accounting principle, Effect of Change on Balance Sheets (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Consolidated Balance Sheets [Abstract]
Inventories	$ 10,907	$ 7,711
Deferred tax assets	7,325	5,143
Retained earnings	$ 8,842	15,566	$ 19,607
Previously Reported [Member]
Condensed Consolidated Balance Sheets [Abstract]
Inventories		7,720
Deferred tax assets		5,141
Retained earnings		15,573	$ 19,718
Effect of Change [Member] | Change in Method of Inventory Valuation to Average Costing [Member]
Condensed Consolidated Balance Sheets [Abstract]
Inventories		(9)
Deferred tax assets		2
Retained earnings		$ (7)