6. Earnings Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings per share:
Weighted average common shares - basic	26,093,000	25,290,000	25,989,000	24,895,000
Incremental common shares attibutable to exercise of outstanding options and warrants	5,383,000	6,750,000	5,807,000	7,126,000
Weighted average common shares - diluted	31,476,000	32,040,000	31,796,000	32,021,000