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Revenue Recognition and Contracts with Customers (Details Textual) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 02, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Jul. 01, 2018
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets |  |  |  |  |  | $ 720,000
New Accounting Pronouncement or Change in Accounting Principle Income Tax Expense Benefit | $ 191,000 |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle Effect of Change In Other Assets | 716,000 |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle Effect of Change on Receivables |  |  |  | $ 2,964,000 |  |
New Accounting Pronouncement or Change in Accounting Principle Effect of Change on Refund Liabilities | $ 1,627,000 |  |  |  |  |
Sales Returns and Allowances [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 8.00% |  | 8.00% |
Sales Revenue, Product Line [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  | 5.00% |  | 7.00% |  |

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