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Note 9 - Stock-based Compensation Expense - Stock Option Plan (Details) - $ / shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Exercised during period (in shares)	0
Ending balance, number outstanding (in shares)	410,000
Number of shares exercisable (in shares)	370,000	292,000
The 2001 Non-qualified Stock Option Plan [Member]
Beginning balance, number outstanding (in shares)	7,000
Granted during period (in shares)
Exercised during period (in shares)
Canceled during period (in shares)	(7,000)
Ending balance, number outstanding (in shares)
Number of shares exercisable (in shares)
Beginning balance, weighted average exercise price (in dollars per share)	$ 7.90
Granted during period, weighted average exercise price (in dollars per share)
Exercised during period, weighted average exercise price (in dollars per share)
Canceled during period, weighted average exercise price (in dollars per share)	7.90
Ending balance, weighted average exercise price (in dollars per share)
Number of options exercisable, weighted average exercise price (in dollars per share)
The 2007 Share Incentive Plan [Member]
Beginning balance, number outstanding (in shares)	345,000
Granted during period (in shares)
Exercised during period (in shares)
Canceled during period (in shares)
Ending balance, number outstanding (in shares)	345,000
Number of shares exercisable (in shares)	305,000
Beginning balance, weighted average exercise price (in dollars per share)	$ 12.33
Granted during period, weighted average exercise price (in dollars per share)
Exercised during period, weighted average exercise price (in dollars per share)
Canceled during period, weighted average exercise price (in dollars per share)
Ending balance, weighted average exercise price (in dollars per share)	12.33
Number of options exercisable, weighted average exercise price (in dollars per share)	$ 12.33
The 2016 Share Incentive Plan [Member]
Beginning balance, number outstanding (in shares)	65,000
Granted during period (in shares)
Exercised during period (in shares)
Canceled during period (in shares)
Ending balance, number outstanding (in shares)	65,000
Number of shares exercisable (in shares)	65,000
Beginning balance, weighted average exercise price (in dollars per share)	$ 5.94
Granted during period, weighted average exercise price (in dollars per share)
Exercised during period, weighted average exercise price (in dollars per share)
Canceled during period, weighted average exercise price (in dollars per share)
Ending balance, weighted average exercise price (in dollars per share)	5.94
Number of options exercisable, weighted average exercise price (in dollars per share)	$ 5.94

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average price of options that were either forfeited or expired.

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