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Note 4 - Facility Relocation - Facility Relocation Costs (Details) - Relocation of Omaha and Traverse City Biological Indicator Manufacturing Facilities [Member]
3 Months Ended
Jun. 30, 2017
USD ($)
Beginning balance $ 673,000
Facility relocation expense 522,000
Cash payments (594,000)
Ending balance $ 601,000