Note 1 - Nature of Operations and Summary of Significant Accounting Policies - Earnings (Loss) Per Common Share (Details) - USD ($) |
3 Months Ended | 12 Months Ended | |
|---|---|---|---|
Mar. 31, 2019 |
Mar. 31, 2018 |
Dec. 31, 2018 |
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| Net Income (loss) | $ 952,644 | $ (31,614) | |
| Basic weighted average shares (in shares) | 13,751,196 | 13,587,837 | 13,669,107 |
| Effect of dilutive securities: | |||
| Unvested restricted stock and stock options (in shares) | 504,810 | ||
| Weighted average common shares outstanding - diluted (in shares) | 14,256,006 | 13,587,837 | 14,031,717 |
| Basic earnings (loss) per share (in dollars per share) | $ 0.07 | $ 0 | $ 0.01 |
| Diluted earnings (loss) per share (in dollars per share) | $ 0.07 | $ 0 | $ 0.01 |
| Restricted Stock [Member] | |||
| Effect of dilutive securities: | |||
| Anti-dilutive securities (in shares) | 31,247 | 63,700 | |
| Share-based Payment Arrangement, Option [Member] | |||
| Effect of dilutive securities: | |||
| Anti-dilutive securities (in shares) | 533,039 | 1,053,811 | |
| Warrant [Member] | |||
| Effect of dilutive securities: | |||
| Anti-dilutive securities (in shares) | 90,000 | ||
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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