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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Apr. 01, 2020 USD ($) | Aug. 12, 2019
Number of Operating Segments |  |  |  |  |  | 4 |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  | $ 72,359,000 |  |  |  | $ 74,724,000 | $ 72,359,000 |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance |  |  |  |  |  |  |  | $ (9,000) |
The Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 1.375% |  | 1.375% |  |  |
The Notes [Member] | Senior Notes [Member] |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.375% |  |  |  | 1.375% | 1.375% |  | 1.375%
Revision of Prior Period, Adjustment [Member] |  |  |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit), Ending Balance | $ 192,000 |  |  |  |  |  |  |  |
Overstatement of Cost of Revenues [Member] |  |  |  |  |  |  |  |  |
Quantifying Misstatement in Current Year Financial Statements, Amount | 372,000 |  |  |  |  |  | $ 429,000 |  |
Overstatement of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |
Quantifying Misstatement in Current Year Financial Statements, Amount |  |  |  |  |  |  | 429,000 |  |
Amount By Which Operating Income Would Increase if Cost of Revenues Had Not Been Overstated [Member] |  |  |  |  |  |  |  |  |
Quantifying Misstatement in Current Year Financial Statements, Amount |  |  |  |  |  |  | 429,000 |  |
Amount By Which Net Income Would Increase if Cost of Revenues Had Not Been Overstated [Member] |  |  |  |  |  |  |  |  |
Quantifying Misstatement in Current Year Financial Statements, Amount |  |  |  |  |  |  | 429,000 |  |
Amount By Which Diluted Earnings Per Share Would Increase if Cost of Revenues Had Not Been Overstated [Member] |  |  |  |  |  |  |  |  |
Quantifying Misstatement in Current Year Financial Statements, Amount | 0.04 |  |  |  |  |  | $ 0.10 |  |
Overstatement of Cost of Goods Sold [Member] |  |  |  |  |  |  |  |  |
Quantifying Misstatement in Current Year Financial Statements, Amount |  | $ 128,000 | $ 126,000 | $ 110,000 | $ 65,000 |  |  |  |
Understatement of Net Income [Member] |  |  |  |  |  |  |  |  |
Quantifying Misstatement in Current Year Financial Statements, Amount |  | $ 128,000 | $ 126,000 | $ 110,000 | $ 65,000 |  |  |  |
Amount By Which After-tax Income Would Increase if Cost of Revenues Had Not Been Overstated [Member] |  |  |  |  |  |  |  |  |
Quantifying Misstatement in Current Year Financial Statements, Amount | $ 192,000 |  |  |  |  |  |  |  |

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details
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