7. Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Common Stock
Beginning balance, shares	13,882,937	13,844,584
Beginning balance, amount	$ 8,330	$ 8,307
Stock options exercised and issued, shares	1,000
Ending balance, shares	13,883,937	13,844,584
Ending balance, amount	$ 8,330	$ 8,307
Additional Paid In Capital
Beginning balance, amount	25,867	25,642
Stock options exercised and issued, amount	2
Share-based compensation expense	31	21
Restricted stock unit compensation expense	41	34
Ending balance, amount	25,941	25,697
Accumulated Deficit
Beginning balance, amount	(2,393)	(5,450)
Dividends declared ($0.02 per share)	(254)	(271)
Net loss	(1,318)	(443)
Effect of adoption of ASU 2016-01		4,318
Ending balance, amount	(3,965)	(1,846)
Accumulated Other Comprehensive Income
Beginning balance, amount		4,318
Effect of adoption of ASU 2016-01		(4,318)
Ending balance, amount		0
Treasury Stock
Beginning balance, amount	(4,092)	(810)
Repurchase of common stock	(337)	(357)
Ending balance, amount	(4,429)	(1,167)
Beginning balance, amount	$ 27,712	32,007
Stock options exercised and issued, shares	1,000
Stock options exercised and issued, amount	$ 2
Share-based compensation expense	31	21
Restricted stock unit compensation expense	41	34
Dividends declared ($0.02 per share)	(254)	(271)
Net loss	(1,318)	(443)
Effect of adoption of ASU 2016-01		0
Repurchase of common stock	(337)	(357)
Ending balance, amount	$ 25,877	$ 30,991