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Note D - Summary of Product Warranties (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Balance at beginning of year $ 1,166us-gaap_ProductWarrantyAccrual $ 1,170us-gaap_ProductWarrantyAccrual
Provision 185us-gaap_ProductWarrantyAccrualWarrantiesIssued 488us-gaap_ProductWarrantyAccrualWarrantiesIssued
Claims (280)us-gaap_ProductWarrantyAccrualPayments (486)us-gaap_ProductWarrantyAccrualPayments
Balance at end of period $ 1,071us-gaap_ProductWarrantyAccrual $ 1,172us-gaap_ProductWarrantyAccrual