Leases - Annual future commitments under non-cancelable leases (Details) - USD ($)	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Lease Obligations, Operating Leases
2020	$ 5,706,000.00
2021	4,920,000.00
2022	4,682,000.00
2023	3,910,000.00
2024	2,394,000.00
Thereafter	2,928,000.00
Total minimum future obligations	24,540,000.00
Less interest	(3,341,000.00)
Present value of net future minimum obligations	21,199,000.00
Less current lease obligations	(4,619,000.00)	$ (2,921,000)
Long-term lease obligations	16,580,000.00	7,644,000
Lease Obligations, Finance Leases
2020	1,771,000
2021	1,329,000
2022	1,150,000
2023	1,072,000
2024	16,000
Thereafter	3,000
Total minimum future obligations	5,341,000
Less interest	(437,000)
Present value of net future minimum obligations	4,904,000
Less current lease obligations	(1,573,000)	(1,500,000)	$ (1,455,000)
Long-term lease obligations	$ 3,331,000	$ 2,319,000	$ 2,319,000