Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Taxes Paid		$ 577,000
Income tax refunds	$ 133,000
Interest paid	2,500,000	815,000
Interest paid, Capitalized	0	0
Convertible notes face amount	177,450,000
Net realized gain loss on investments	(576,000)	117,000
Proceeds from Sale of Investment Securities	6,252,362	$ 834,964
Reduction in the value of accrued stock based Compensation	$ 60,000
4.50% Convertible Senior Notes due 2020 [Member]
Debt Instrument Maturity Year	2020
Equity component of the convertible notes issued	$ 2,100,000
Decrease in long-term debt	3,400,000
Increase in deferred income taxes	1,300,000
Convertible notes face amount	$ 75,000,000