7. Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Beginning Balance, Amount			$ 35,774
Beginning Balance, Shares			13,754,749
Common stock option exercised and issued, Amount			$ 183
Share-based compensation expense			34
RSUs compensation expense			41	$ 0
Dividends declared			(1,791)
Net income	$ 600	$ 719	650	2,597
Unrealized gain on available- for-sales securities			2,453
Repurchase of common stock			(405)	$ (83)
Ending Balance, Amount	$ 36,939		$ 36,939
Ending Balance, Shares	13,844,584		13,844,584
Common Stock
Beginning Balance, Amount			$ 8,253
Beginning Balance, Shares			13,754,749
Common stock option exercised and issued, Amount			$ 54
Common stock option exercised and issued, Shares			89,835
Ending Balance, Amount	$ 8,307		$ 8,307
Ending Balance, Shares	13,844,584		13,844,584
Additional Paid In Capital
Beginning Balance, Amount			$ 25,382
Common stock option exercised and issued, Amount			129
Share-based compensation expense			34
RSUs compensation expense			41
Ending Balance, Amount	$ 25,586		25,586
Retained Earnings
Beginning Balance, Amount			240
Dividends declared			(1,791)
Net income			650
Ending Balance, Amount	(901)		(901)
Accumulated Other Comprehensive Income
Beginning Balance, Amount			2,061
Unrealized gain on available- for-sales securities			2,453
Ending Balance, Amount	4,514		4,514
Treasury Stock
Beginning Balance, Amount			(162)
Repurchase of common stock			(405)
Ending Balance, Amount	$ (567)		$ (567)