Fair Value Measurement (Schedule Of Carrying Value And Fair Value Of Financial Assets Disclosed) (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Apr. 02, 2012
Cash, Carrying Value	$ 20,501,601	$ 20,810,018
Cash, Estimated Fair Value	20,501,601	20,810,018
Cost-basis investment, Carrying Value	1,754,060	1,871,315
Cost-basis investment, Estimated Fair Value	1,848,949	1,952,323
Accrued dividends and interest, Carrying Value	882,517	1,037,447
Accrued dividends and interest, Estimated Fair Value	882,517	1,037,447
Total Financial Assets, Carrying Value	23,138,178	23,718,780
Total Financial Assets, Estimated Fair Value	23,233,067	23,799,788
Contingent consideration, Carrying Value	691,250	691,250
Contingent consideration, Estimated Fair Value	691,250	691,250	691,250
Total Financial Liabilities, Carrying Value	691,250	691,250
Total Financial Liabilities, Estimated Fair Value	691,250	691,250
Level 1 [Member]
Cash, Estimated Fair Value	20,501,601	20,810,018
Cost-basis investment, Estimated Fair Value	0	0
Accrued dividends and interest, Estimated Fair Value	882,517	1,037,447
Total Financial Assets, Estimated Fair Value	21,384,118	21,847,465
Contingent consideration, Estimated Fair Value	0	0
Total Financial Liabilities, Estimated Fair Value	0	0
Level 2 [Member]
Cash, Estimated Fair Value	0	0
Cost-basis investment, Estimated Fair Value	0	0
Accrued dividends and interest, Estimated Fair Value	0	0
Total Financial Assets, Estimated Fair Value	0	0
Contingent consideration, Estimated Fair Value	0	0
Total Financial Liabilities, Estimated Fair Value	0	0
Level 3 [Member]
Cash, Estimated Fair Value	0	0
Cost-basis investment, Estimated Fair Value	1,848,949	1,952,323
Accrued dividends and interest, Estimated Fair Value	0	0
Total Financial Assets, Estimated Fair Value	1,848,949	1,952,323
Contingent consideration, Estimated Fair Value	691,250	691,250
Total Financial Liabilities, Estimated Fair Value	$ 691,250	$ 691,250