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to Repurchase [Line Items] License and Service License and Service [Member] Local Phone Number Local Phone Number Schedule of Stock by Class Schedule of Stock by Class [Table] Total intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Officers And Board Of Directors Chairman Officers And Board Of Directors Chairman [Member] Officers And Board Of Directors Chairman Warrants and rights outstanding, measurement input Warrants and Rights Outstanding, Measurement Input Depreciation Depreciation Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Entity Emerging Growth Company Entity Emerging Growth Company Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Sale of stock, shelf registration maximum equity offering price Sale of Stock, Shelf Registration Maximum Equity Offering Price 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Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Discount rate Measurement Input, Discount Rate [Member] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract]