7. Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 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			16
RSUs compensation expense			6	$ 0
Dividends declared			(1,517)
Net income	$ 1,318	$ 1,365	50	1,878
Unrealized gain on available- for-sales securities			2,478
Repurchase of common stock			(217)	$ (22)
Ending Balance, Amount	$ 36,773		$ 36,773
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			16
RSUs compensation expense			6
Ending Balance, Amount	$ 25,533		25,533
Retained Earnings
Beginning Balance, Amount			240
Dividends declared			(1,517)
Net income			50
Ending Balance, Amount	(1,227)		(1,227)
Accumulated Other Comprehensive Income
Beginning Balance, Amount			2,061
Unrealized gain on available- for-sales securities			2,478
Ending Balance, Amount	4,539		4,539
Treasury Stock
Beginning Balance, Amount			(162)
Repurchase of common stock			(217)
Ending Balance, Amount	$ (379)		$ (379)