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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 01, 2018 | Jun. 30, 2019 | Mar. 31, 2019 | Mar. 31, 2019 | Mar. 31, 2018
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property |  |  |  | $ 22,000 | $ 28,000
Other Operating Income (Expense) [Member] |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax, Total |  |  | $ 183,000 |  |
AOCI Attributable to Parent [Member] |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax, Total |  |  | $ 3,498 |  |
Forecast [Member] |  |  |  |  |
Proceeds from Sale of Manufacturing Facility, Gross |  | $ 12,000,000 |  |  |
Forecast [Member] | Minimum [Member] |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property |  | 3,000,000 |  |  |
Forecast [Member] | Maximum [Member] |  |  |  |  |
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property |  | $ 5,500,000 |  |  |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax, Total | $ 591,000 |  |  |  |

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