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Note 6 - Borrowings (Details) - Leverage Ratio of Interest Rate | 6 Months Ended
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Jun. 30, 2013
Base Rate Margin [Member] | Leverage Ratio 1 [Member] |
Debt Instrument [Line Items] |
Leverage Ratio | (0.55%)
Base Rate Margin [Member] | Leverage Ratio 2 [Member] |
Debt Instrument [Line Items] |
Leverage Ratio | (0.70%)
Base Rate Margin [Member] | Leverage Ratio 3 [Member] |
Debt Instrument [Line Items] |
Leverage Ratio | (1.00%)
Base Rate Margin [Member] | Leverage Ratio 4 [Member] |
Debt Instrument [Line Items] |
Leverage Ratio | (1.00%)
LIBOR Margin [Member] | Leverage Ratio 1 [Member] |
Debt Instrument [Line Items] |
Leverage Ratio | 1.70%
LIBOR Margin [Member] | Leverage Ratio 2 [Member] |
Debt Instrument [Line Items] |
Leverage Ratio | 1.50%
LIBOR Margin [Member] | Leverage Ratio 3 [Member] |
Debt Instrument [Line Items] |
Leverage Ratio | 1.25%
LIBOR Margin [Member] | Leverage Ratio 4 [Member] |
Debt Instrument [Line Items] |
Leverage Ratio | 1.00%

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration