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Note 3 - Valuation and Qualifying Accounts | 12 Months Ended
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Mar. 31, 2022
Notes to Financial Statements |
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | (3) Valuation and Qualifying Accounts Activity in the Company's valuation and qualifying accounts consists of the following (in thousands):
|  | Year Ended March 31, |
|  | 2022 |  |  | 2021 |  |  | 2020 |
Allowance for doubtful accounts: |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  | $ | 39 |  |  | $ | 59 |  |  | $ | 39 |
Provision for doubtful accounts |  |  | 165 |  |  |  | 130 |  |  |  | 191 |
Write-off of uncollectible accounts receivable |  |  | (165 | ) |  |  | (150 | ) |  |  | (171 | )
Balance at end of year |  | $ | 39 |  |  | $ | 39 |  |  | $ | 59 |

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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