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Note 2 - Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
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, |
|  | 2019 |  |  | 2018 |
Net income (numerator) |  | $ | 3,000,000 |  |  | $ | 3,625,000 |
Shares (denominator): |  |  |  |  |  |  |  |
Basic weighted average common shares outstanding |  |  | 13,142,872 |  |  |  | 13,909,688 |
Add: Dilutive effect of common stock options |  |  | 25,853 |  |  |  | 53,131 |
Diluted weighted average common shares outstanding |  |  | 13,168,725 |  |  |  | 13,962,819 |
Earnings per common share: |  |  |  |  |  |  |  |
Basic |  | $ | 0.23 |  |  | $ | 0.26 |
Diluted |  | $ | 0.23 |  |  | $ | 0.26 |
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 2019 |  | $ | 335,000 |  |  | $ | 335,000 |  |  | $ | - |  |  | $ | - |
Marketable securities 2018 |  |  | 258,000 |  |  |  | 258,000 |  |  |  | - |  |  |  | - |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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