Note 7 - Stock-based Compensation and Other Plans (Details Textual) - USD ($) shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Employee Stock Option [Member] | The 2008 Plan [Member]
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 45,000	$ 58,000	$ 103,000	$ 154,000
Allocated Share-based Compensation Expense	119,000	153,000	271,000	406,000
Restricted Stock [Member]
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	5,600	2,300	13,300	51,300
Allocated Share-based Compensation Expense	15,000	$ 6,000	35,000	$ 135,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 155,200		$ 155,200
The 2008 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1.3		1.3
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	$ 604,500		$ 604,500