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Note 11 - Summary of Quarterly Results of Operations (Unaudited) (Tables) | 12 Months Ended
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Mar. 31, 2020
Notes Tables |
Quarterly Financial Information [Table Text Block] |
|  | Quarter Ended |
|  | June 30, 2019 |  |  | September 30, 2019 |  |  | December 31, 2019 |  |  | March 31, 2020 |
Net sales |  | $ | 40,975,320 |  |  | $ | 39,995,580 |  |  | $ | 28,150,817 |  |  | $ | 32,980,607 |
Gross profit (loss) |  |  | 1,471,324 |  |  |  | (782,650 | ) |  |  | 52,933 |  |  |  | 1,868,728 |
Net earnings (loss) |  |  | 194,772 |  |  |  | (1,544,137 | ) |  |  | (881,003 | ) |  |  | (3,018,842 | )
Basic |  |  | .03 |  |  |  | (.22 | ) |  |  | (.13 | ) |  |  | (.43 | )
Diluted |  |  | .03 |  |  |  | (.22 | ) |  |  | (.13 | ) |  |  | (.43 | )
|  | Quarter Ended |
|  | June 30, 2018 |  |  | September 30, 2018 |  |  | December 31, 2018 |  |  | March 31, 2019 |
Net sales |  | $ | 48,193,318 |  |  | $ | 53,432,029 |  |  | $ | 43,326,080 |  |  | $ | 42,203,066 |
Gross profit |  |  | 6,192,478 |  |  |  | 3,944,541 |  |  |  | 1,930,484 |  |  |  | 839,534 |
Net earnings (loss) |  |  | 3,599,893 |  |  |  | 2,000,916 |  |  |  | 664,773 |  |  |  | (1,165,658 | )
Basic (1) |  |  | .51 |  |  |  | .29 |  |  |  | .09 |  |  |  | (.17 | )
Diluted (1) |  |  | .51 |  |  |  | .29 |  |  |  | .09 |  |  |  | (.17 | )

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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