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Note 13 - Stock-based Compensation Plan (Details) - Fair Value Assumptions of Options Granted (Black Scholes Pricing Model [Member])
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12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Black Scholes Pricing Model [Member]
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| Note 13 - Stock-based Compensation Plan (Details) - Fair Value Assumptions of Options Granted [Line Items] | |||
| Expected Life of the Option Term (years) | 3 years 255 days | 3 years 328 days | 3 years 328 days |
| Risk-free interest rate | 1.20% | 0.90% | 1.20% |
| Dividend rate | 0.00% | 0.00% | 0.00% |
| Volatility | 76.20% | 83.80% | 73.90% |
| Forfeiture rate | 5.30% | 8.10% | 9.00% |