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Shareholders' Equity (Schedule of Activity in Options and Warrants) (Details) (USD $)
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12 Months Ended | |||
|---|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Employee Stock Option [Member]
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| Number of Shares Underlying Warrants and Options | ||||
| Balance | 1,117,899 | 1,269,649 | 1,734,199 | |
| Granted/Issued | 499,700 | |||
| Cancelled/Terminated | (64,500) | (151,750) | (379,550) | |
| Exercised | (72,500) | (85,000) | ||
| Balance | 1,480,599 | 1,117,899 | 1,269,649 | 1,734,199 |
| Weighted Average Exercise Price | ||||
| Balance | $ 9.03 | $ 9.48 | $ 11.64 | |
| Granted/Issued | $ 5.26 | |||
| Cancelled/Terminated | $ 12.81 | $ 12.76 | $ 20.43 | |
| Exercised | $ 4.83 | $ 3.72 | ||
| Balance | $ 7.80 | $ 9.03 | $ 9.48 | $ 11.64 |
| Weighted Average Remaining Contractual Term (Years) | 5 years 2 months 12 days | 3 years 8 months 12 days | 4 years 2 months 12 days | 4 years 3 months 18 days |
| Aggregate Intrinsic Value | $ 399,000 | $ 4,250 | $ 281,600 | |
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Non-Employee Stock Options and Warrants [Member]
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| Number of Shares Underlying Warrants and Options | ||||
| Balance | 1,512,103 | 704,257 | 708,909 | |
| Granted/Issued | 807,846 | |||
| Cancelled/Terminated | (25,000) | |||
| Exercised | (107,483) | (4,652) | ||
| Balance | 1,379,620 | 1,512,103 | 704,257 | |
| Weighted Average Exercise Price | ||||
| Balance | $ 5.56 | |||
| Granted/Issued | $ 5.12 | |||
| Cancelled/Terminated | $ 9.00 | |||
| Exercised | $ 4.45 | $ 5.64 | ||
| Balance | $ 5.58 | $ 5.56 | ||
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Non-Employee Stock Options and Warrants [Member] | Minimum [Member]
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| Weighted Average Exercise Price | ||||
| Balance | $ 5.00 | $ 5.00 | ||
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Non-Employee Stock Options and Warrants [Member] | Maximum [Member]
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| Weighted Average Exercise Price | ||||
| Balance | $ 9.00 | $ 9.00 | ||