Annual report pursuant to Section 13 and 15(d)

Note 5 - Stock-based Compensation (Details Textual)

Note 5 - Stock-based Compensation (Details Textual) - USD ($)	1 Months Ended					9 Months Ended	12 Months Ended
	Oct. 31, 2017	Feb. 28, 2016	Jul. 31, 2015	May 31, 2015	Apr. 30, 2015	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allocated Share-based Compensation Expense							$ 394,000	$ 278,000	$ 2,400,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense							$ 0	$ 0	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value							$ 0.19	$ 0.53	$ 1.67
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period							50,000	50,000	146,625
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value							$ 4,400	$ 23,000	$ 144,000
Stock Issued During Period, Shares, Share-based Compensation, Gross							50,000	50,000	124,238
Proceeds from Stock Options Exercised							$ 18,100	$ 13,500	$ 66,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value							0	3,000	277,000
Payments Related to Tax Withholding for Share-based Compensation							0	$ 0	$ 23,906
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized							$ 176,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition						1 year	1 year 73 days
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period							207,000	66,000	333,250
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value							$ 99,000	$ 63,000	$ 511,000
Restricted Stock [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value									$ 193,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period							17,000	66,000	120,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value							$ 9,000	$ 63,000
Stock Issued During Period, Shares, Share-based Compensation, Forfeited	50,000		61,000				140,000	106,000
Stock Issued During Period, Value, Share-based Compensation, Forfeited	$ 22,000		$ 107,000				$ 65,000	$ 118,000
Restricted Stock [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value					$ 32,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period					20,000		50,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value							$ 25,000
Stock Issued During Period, Shares, Share-based Compensation, Forfeited		100,000		20,000
Stock Issued During Period, Value, Share-based Compensation, Forfeited		$ 96,000		$ 25,000
Restricted Stock [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value									$ 286,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period									193,250
Stock Issued During Period, Shares, Share-based Compensation, Forfeited									27,000
Stock Issued During Period, Value, Share-based Compensation, Forfeited									$ 50,000