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Note 5 - Stock-Based Compensation (Details) - Restricted Stock Units | 1 Months Ended | 12 Months Ended | 6 Months Ended
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Apr. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2013 Restricted Stock Units (RSUs) [Member]
Note 5 - Stock-Based Compensation (Details) - Restricted Stock Units [Line Items] |  |  |  |  |
Balance at December 31, 2012 |  |  |  |  | 256,616
Balance at June 30, 2013 |  |  |  |  | 211,222
Granted | 6,729 | 14,416 | 125,133 | 147,661 | 21,145
Forfeited |  |  |  |  | 0
Vested |  |  |  |  | (66,539)

X
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