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Note 10 - Basic and Diluted Earnings Per Common Share (Details Textual) - shares	3 Months Ended			6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Stock Buyback Program 2019 [Member]
Stock Repurchased and Retired During Period, Shares	0			0
Stock Buyback Program 2018 [Member]
Stock Repurchased and Retired During Period, Shares			0	0	0
Stock Buyback Program 2017 [Member]
Stock Repurchased and Retired During Period, Shares					0
Share-based Payment Arrangement, Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount		260,700	419,000	260,700	449,000

X

- 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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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X

- Definition

Number of shares that have been repurchased and retired during the period.

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Topic 505
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