Note 2 - Summary of Significant Accounting Policies - Weighted Average Common Shares (Details) - shares	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Weighted average common shares outstanding - basic (in shares)	10,421,383	10,355,673	10,405,892	10,341,552
Unvested shares of restricted stock and employee stock options (in shares)	8,153		17,229	35,953
Weighted average common shares and common share equivalents outstanding - diluted (in shares)	10,429,536	10,355,673	10,423,121	10,377,505
Average number of potentially dilutive securities excluded from calculation (in shares)	657,969	360,970	501,964	188,339

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.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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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.

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