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Note 7 - Financing Arrangements (Details Textual) (Revolving Credit Facility [Member], USD $)
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Debt Disclosure [Abstract]      
Line of Credit Facility, Maximum Borrowing Capacity $ 7,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity $ 9,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity $ 7,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Line of Credit Facility, Remaining Borrowing Capacity 9,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity    
Long-term Line of Credit $ 0us-gaap_LineOfCredit    
Line of Credit Facility, Interest Rate at Period End 0.16925%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd    
London Interbank Offered Rate (LIBOR) [Member]
     
Debt Disclosure [Abstract]      
Derivative, Basis Spread on Variable Rate 1.50%us-gaap_DerivativeBasisSpreadOnVariableRate
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember