Accrued Expenses and Other Current Liabilities (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Accrued Expenses and Other Current Liabilities
Unearned revenue from contracts with customers	$ 3,066,000	$ 4,388,000
Accrued fines and penalties	407	407
Unearned contract renewal income	400,000	400,000
Board of director fees payable	263,000	230,000
Other payable	207,000	218,000
Taxes payable	203,000	136,000
Customer deposits	173,000	173,000
Insurance	136,000	273,000
Total	$ 4,855,000	$ 6,225,000