6. Earnings Per Share (Details) - shares	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings per share:
Weighted average common shares - basic	25,296,000	25,635,000
Incremental common shares attibutable to exercise of outstanding options and warrants	4,858,000	6,356,000
Weighted average common shares - diluted	30,154,000	31,991,000