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Note R - Segment Information (Details Textual) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member] | Banking [Member] |  |  |
Concentration Risk, Percentage | 92.90% | 92.70% | 91.60%

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