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6. Earnings Per Share (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Earnings per share:        
Weighted average common shares - basic 23,894,000 26,093,000 24,574,000 25,989,000
Incremental common shares attibutable to exercise of outstanding options and warrants 4,609,000 5,383,000 4,679,000 5,807,000
Weighted average common shares - diluted 28,503,000 31,476,000 29,253,000 31,796,000