Income Taxes - Expense (benefit) reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Income Taxes
Statutory federal income tax rate (as a percent)	21.00%		21.00%
Tax at the statutory federal rate	$ 555	$ 107
State income taxes (net of federal benefit)	116	22
2017 qualified timber gains at the federal statutory rate of 23.8%		(345)
Decrease in valuation allowance, net		(33)
Other	(10)
Total income tax expense (benefit)	$ 661	$ (249)
Timber statutory federal rate		23.80%

Preferential tax rate on C Corporation Qualified Timber Gains under the Bipartisan Budget Act of 2018.

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