7. Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Common Stock
Beginning balance, shares	13,929,381	13,882,937
Beginning balance, amount	$ 8,357	$ 8,330
Stock options exercised and issued, shares		1,000
Net loss
Ending balance, shares	13,929,381	1,388,397
Ending balance, amount	$ 8,357	$ 8,330
Additional Paid-In Capital
Beginning balance, amount	26,095	25,867
Stock options exercised and issued, amount		2
Share-based compensation expense	30	31
Restricted stock unit compensation expense	21	41
Net loss
Ending balance, amount	26,146	25,941
Accumulated Deficit
Beginning balance, amount	(6,043)	(2,393)
Dividends declared ($0.02 per share)	(250)	(254)
Net loss	(1,192)	(1,318)
Ending balance, amount	(7,485)	(3,965)
Treasury Stock
Beginning balance, amount	(5,133)	(4,092)
Net loss
Repurchase of common stock	(243)	(337)
Ending balance, amount	(5,376)	(4,429)
Beginning balance, amount	23,276	27,712
Stock options exercised and issued, amount		2
Share-based compensation expense	30	31
Restricted stock unit compensation expense	21	41
Dividends declared ($0.02 per share)	(250)	(254)
Net loss	(1,192)	(1,318)
Repurchase of common stock	(243)	(337)
Ending balance, amount	$ 21,642	$ 25,877