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Note 11 - Stockholders' Equity (Details Textual) - USD ($)				1 Months Ended		12 Months Ended
	Aug. 08, 2014	Jun. 09, 2014	Jun. 06, 2013	Feb. 28, 2015	Feb. 28, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Aug. 31, 2015
2007 Director Non-Qualified Stock Option Plan [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options						$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period						6 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized						100,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period						10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant						21,400
Restricted Stock Plan [Member] | Restricted Stock [Member] | Executive Officers, Non-employee Directors and Other Key Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized						300,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant						230,915
Restricted Stock Plan [Member] | Restricted Stock [Member] | Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				9,344	9,375
Restricted Stock Plan [Member] | Restricted Stock [Member] | Independent Director 1 Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				1,613	1,619
Restricted Stock Plan [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period								0
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period						4 years
Restricted Stock Plan [Member] | Operating Expense [Member]
Allocated Share-based Compensation Expense						$ 145,321
Stockholder Rights Plan [Member]
Dividends, Common Stock, Preferred Share Purchase Rights Per Share			$ 1
Common Stock, Par or Stated Value Per Share			0.0024
Class of Warrant or Right, Exercise Price of Warrants or Rights			$ 30
Class Of Warrant Or Right Exercisable, Condition Common Stock Ownership, Percentage			20.00%
Restricted Stock [Member] | Operating Expense [Member]
Allocated Share-based Compensation Expense							$ 67,818
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period						34,484	34,601
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period						4 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized						300,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized						$ 406,897	$ 242,207
Treasury Stock, Shares, Acquired						529,000	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period						180 days
Proceeds from Issuance of Common Stock						$ 9,920	$ 52,722	$ 113,800
Allocated Share-based Compensation Expense						$ 0	$ 0	$ 11,686
Common Stock, Dividends, Per Share, Declared		$ 0.25
Payments of Dividends	$ 2,500,000
Common Stock, Par or Stated Value Per Share						$ 0.0024	$ 0.0024
Stock Repurchase Program, Number of Shares Authorized to be Repurchased									1,200,000
Treasury Stock Acquired, Average Cost Per Share						$ 7.01
Treasury Stock, Value, Acquired, Cost Method						$ 3,708,862

X

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Aggregate dividends declared during the period for each share of common stock outstanding.

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