Commitments and Contingent Liabilities (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 25, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Loss Contingencies [Line Items]
Royalty Revenue, Total		$ 5,097,000	$ 7,735,000	$ 10,302,000	$ 16,678,000
Dividends Payable, Amount Per Share		$ 0.50		$ 0.50
Dividends Payable		$ 22,100,000		$ 22,100,000
Sigma Tau [Member]
Loss Contingencies [Line Items]
Loss Contingency, Allegations				826,128
Payments for Legal Settlements	$ 526,128
Litigation Settlement, Amount	$ 826,128
Loss Contingency, Settlement Agreement, Terms				under the Agreement in the second quarter of 2015, but under the terms of the settlement agreed to pay to the Company $300,000 (the Settlement Amount), which is included in other current assets in the accompanying balance sheet
Accrued Royalties						$ 826,128
Royalty Revenue, Total		$ 300,000