Income Taxes (Details) - USD ($)		3 Months Ended		12 Months Ended
	Jan. 01, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Deferred tax amounts included in balance sheet
U.S. federal income tax rate (as a percent)	21.00%			35.00%
Income tax benefit		$ 20,416	$ 222,923
Effective tax rate (as a percent)		13.50%	37.00%
Unrecognized tax benefits		$ 0	$ 0
Valuation allowance		91,000
Federal
Deferred tax amounts included in balance sheet
Federal net operating loss carryforwards		167,000
Research and development credit		27,000
State
Deferred tax amounts included in balance sheet
State net operating loss carryforwards		834,000
Research and development credit		$ 91,000