v3.19.1

Summary of Significant Accounting Policies - Recent accounting pronouncements - Changes made to consolidated balance sheet (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2016
Assets
Deferred income taxes	$ 1,456,000	$ 1,786,000	$ 2,238,000	$ 680,000
Liabilities
Accounts payable	2,865,000	2,571,000	2,760,000	2,440,000
Accrued liabilities	9,888,000	8,111,000	8,202,000	6,975,000
Deferred credits	76,000	49,000	86,000	137,000
Contract liabilities	4,126,000	3,724,000	3,463,000	3,370,000
Liability for pension benefits	6,883,000	7,483,000	7,775,000	7,509,000
Stockholders' equity
Retained earnings	$ 109,881,000	109,817,000	110,959,000	110,201,000
As Originally Reported
Assets
Deferred income taxes		1,630,000	2,020,000	482,000
Liabilities
Accounts payable		3,769,000	3,749,000	3,380,000
Accrued liabilities		9,811,000	9,854,000	8,635,000
Deferred credits		316,000	361,000	408,000
Liability for pension benefits			7,775,000	7,509,000
Stockholders' equity
Retained earnings		110,220,000	111,288,000	110,502,000
ASU 2014-09 \| Adjustments
Assets
Deferred income taxes		156,000	218,000	198,000
Liabilities
Accounts payable		(1,198,000)	(989,000)	(940,000)
Accrued liabilities		(1,700,000)	(1,652,000)	(1,660,000)
Deferred credits		(267,000)	(275,000)	(271,000)
Contract liabilities		3,724,000	3,463,000	3,370,000
Stockholders' equity
Retained earnings		$ (403,000)	$ (329,000)	$ (301,000)

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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