Stock Compensation Plans (Details) - USD ($)								3 Months Ended		6 Months Ended		12 Months Ended
	May. 05, 2015	Mar. 10, 2015	Dec. 09, 2014	Sep. 09, 2014	Mar. 04, 2014	Aug. 05, 2013	Mar. 04, 2013	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Options Weighted Average Option Exercise Price at [Abstract]
Decrease in income from continuing operations due to change in accounting pronouncement								$ 612,400	$ 273,000	$ 1,364,500	$ 465,000
Decrease in net income due to change in accounting pronouncement								$ 381,700	$ 170,000	$ 850,500	$ 290,000
Net income per share if FASB guidance had not been adopted, basic (in dollars per share)								$ 0.89	$ 1.06	$ 1.60	$ 1.84
Net income per share if FASB guidance had not been adopted, diluted (in dollars per share)								0.87	1.02	1.56	1.78
Net income per share - basic (in dollars per share)								0.86	1.04	1.54	1.81
Net income per share - diluted (in dollars per share)								$ 0.84	$ 1.01	$ 1.50	$ 1.75
Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term of stock options in Black-Scholes option pricing model, previous										4 years
Expected term of stock options in Black-Scholes option pricing model, revised										2 years
1998 Stock Option Plan [Member] | Stock Option [Member]
Stock Option Plans, Number of Shares [Abstract]
Outstanding, beginning of period (in shares)										0	3,000	3,000	78,500
Granted (in shares)										0		0	0
Exercised (in shares)										0		(3,000)	(500)
Cancelled (in shares)										0		0	(75,000)
Outstanding, end of period (in shares)								0		0		0	3,000
Stock Options, Weighted Average Option Exercise Price [Abstract]
Outstanding, beginning of period (in dollars per share)										$ 8.67	$ 8.67	$ 8.67	$ 12.73
Granted (in dollars per share)										0		0	0
Exercised (in dollars per share)										0		8.67	8.67
Cancelled (in dollars per share)										0		0	12.92
Outstanding, end of period (in dollars per share)								$ 0		$ 0		$ 8.67	$ 8.67
2002 Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to grant options to purchase (in shares)								1,800,000		1,800,000		1,800,000
Share-based payment award, expiration date										Apr. 30, 2012
Options exercisable outstanding (in shares)								187,217		187,217		219,285
Options Exercisable at [Abstract]
June 30, 2015 (in shares)								187,217		187,217		219,285
2002 Stock Option Plan [Member] | Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options exercisable outstanding (in shares)								177,017		177,017
Stock Option Plans, Number of Shares [Abstract]
Outstanding, beginning of period (in shares)										219,285	523,521	523,521	702,597
Granted (in shares)										0		0	0
Exercised (in shares)										(32,068)		299,735	(165,577)
Cancelled (in shares)										0		(4,501)	(13,499)
Outstanding, end of period (in shares)								187,217		187,217		219,285	523,521
Stock Options, Weighted Average Option Exercise Price [Abstract]
Outstanding, beginning of period (in dollars per share)										$ 3.79	$ 4.54	$ 4.54	$ 5.17
Granted (in dollars per share)										0		0	0
Exercised (in dollars per share)										3.83		5.10	7.15
Cancelled (in dollars per share)										0		3.49	5.41
Outstanding, end of period (in dollars per share)								$ 3.83		$ 3.83		$ 3.79	$ 4.54
Options Exercisable at [Abstract]
June 30, 2015 (in shares)								177,017		177,017
December 31, 2015 (in shares)								10,200		10,200
December 31, 2016 (in shares)								0		0
December 31, 2017 (in shares)								0		0
December 31, 2018 (in shares)								0		0
December 31, 2019 (in shares)								0		0
Thereafter (in shares)								0		0
Total options exercisable (in shares)								187,217		187,217
Options Weighted Average Option Exercise Price at [Abstract]
June 30, 2015 (in dollars per share)								$ 3.83		$ 3.83
December 31, 2015 (in dollars per share)								3.83		3.83
December 31, 2016 (in dollars per share)								3.83		3.83
December 31, 2017 (in dollars per share)								3.83		3.83
December 31, 2018 (in dollars per share)								3.83		3.83
December 31, 2019 (in dollars per share)								3.83		3.83
Thereafter (in dollars per share)								$ 3.83		$ 3.83
2012 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized to grant options to purchase (in shares)								1,000,000		1,000,000
Share-based payment award, expiration date										Apr. 05, 2022
Other Than Stock Option Plans, Number of Shares [Abstract]
Granted (in shares)		66,140		130,000	88,648	150,000	100,000
2012 Stock Incentive Plan [Member] | Chief Executive Officer and President [Member]
Other Than Stock Option Plans, Number of Shares [Abstract]
Granted (in shares)	50,000	32,997	50,000	45,000	43,997	100,000	25,000
2012 Stock Incentive Plan [Member] | Chief Financial Officer [Member]
Other Than Stock Option Plans, Number of Shares [Abstract]
Granted (in shares)		9,551		15,000	16,341	50,000	15,000
2012 Stock Incentive Plan [Member] | Director [Member]
Other Than Stock Option Plans, Number of Shares [Abstract]
Granted (in shares)		6,252		50,000	15,710		20,000
2012 Stock Incentive Plan [Member] | Other Employees [Member]
Other Than Stock Option Plans, Number of Shares [Abstract]
Granted (in shares)		17,340		20,000	12,600		40,000
2012 Stock Incentive Plan [Member] | Stock Option [Member]
Other Than Stock Option Plans, Number of Shares [Abstract]
Outstanding, beginning of period (in shares)										447,801	249,500	249,500	0
Granted (in shares)										116,140		268,648	250,000
Exercised (in shares)										(83,134)		(68,988)	0
Cancelled (in shares)										0		(1,359)	(500)
Outstanding, end of period (in shares)								480,807		480,807		447,801	249,500
Other Than Stock Options, Fair Market Value at Grant [Abstract]
Outstanding, beginning of period (in dollars per share)										$ 5.54	$ 5.54	$ 5.54	$ 0
Granted (in dollars per share)										25.86		5.54	5.54
Exercised (in dollars per share)										1.37		0	0
Cancelled (in dollars per share)										0		5.54	5.54
Outstanding, end of period (in dollars per share)								$ 14.69		$ 14.69		$ 5.54	$ 5.54