Accounts Receivable (Schedule of Contract Receivables) (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Receivables [Abstract]
Noncurrent receivables	$ 31,177,000	$ 32,049,000
Allowance for expected credit losses	(195,000)	(200,000)
Noncurrent receivables, net	$ 30,982,000	$ 31,849,000