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Note 3 - Selected Balance Sheet Data - Estimated Future Amortization Expense for Intangible Assets (Details)
Mar. 31, 2020
USD ($)
2020 remainder $ 15,423,000
2021 59,545,000
2022 57,335,000
2023 55,469,000
2024 53,008,000
Thereafter 289,553
Total $ 530,333,000