6. Earnings Per Share (Details) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings per share:
Weighted average common shares - basic	23,517,000	25,296,000
Incremental common shares attibutable to exercise of outstanding options and warrants	4,706	4,858
Weighted average common shares - diluted	28,223,000	30,154,000