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Note 6 - Borrowings (Details) - Leverage Ratio of Interest Rate	6 Months Ended
	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