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Note 2 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Property, Plant, and Equipment, Useful Lives [Table Text Block] |
Buildings (in years) |  |  |  |  | 25 |
Machinery and equipment (in years) |  |  | 5 | - | 15 |
Office furniture and equipment (in years) |  |  | 2 | - | 7 |
Leasehold improvements (in years) |  |  | 4 | - | 5 |
Software (in years) |  |  |  |  | 5 |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Years Ended December 31, |
|  | 2020 |  |  | 2019 |
Net income (numerator) |  | $ | 27,086,000 |  |  | $ | 3,000,000 |
Shares (denominator): |  |  |  |  |  |  |  |
Basic weighted average common shares outstanding |  |  | 13,449,987 |  |  |  | 13,142,872 |
Add: Dilutive effect of common stock options |  |  | 522,158 |  |  |  | 25,853 |
Diluted weighted average common shares outstanding |  |  | 13,972,145 |  |  |  | 13,168,725 |
Earnings per common share: |  |  |  |  |  |  |  |
Basic |  | $ | 2.01 |  |  | $ | 0.23 |
Diluted |  | $ | 1.94 |  |  | $ | 0.23 |
Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
|  | Fair Value Measurements as of December 31, |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities 2020 |  | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
Marketable securities 2019 |  |  | 335,000 |  |  |  | 335,000 |  |  |  | - |  |  |  | - |

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