Annual report pursuant to Section 13 and 15(d)

Note 7 - Stockholders' Equity (Details) - Outstanding Warrants

v2.4.1.9
Note 7 - Stockholders' Equity (Details) - Outstanding Warrants (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Jan. 31, 2013
Dec. 31, 2012
Note 7 - Stockholders' Equity (Details) - Outstanding Warrants [Line Items]        
Exercise Price $ 0.91us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 [1] $ 1.33us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 1.20us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 0.95us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Number Outstanding 20,759,136us-gaap_ClassOfWarrantOrRightOutstanding 12,136,865us-gaap_ClassOfWarrantOrRightOutstanding   8,763,836us-gaap_ClassOfWarrantOrRightOutstanding
Weighted-Average Remaining Contractual Life 3 years 135 days      
Intrinsic Value $ 1,185,945mric_ClassOfWarrantOrRightIntrinsicValue [2]      
Range 1 [Member]        
Note 7 - Stockholders' Equity (Details) - Outstanding Warrants [Line Items]        
Exercise Price $ 0.60us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range1Member 		     
Number Outstanding 458,977us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range1Member 		     
Weighted-Average Remaining Contractual Life 3 years 51 days      
Intrinsic Value 105,565mric_ClassOfWarrantOrRightIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range1Member 		[2]      
Range 2 [Member]        
Note 7 - Stockholders' Equity (Details) - Outstanding Warrants [Line Items]        
Exercise Price $ 0.64us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range2Member 		     
Number Outstanding 4,600,842us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range2Member 		     
Weighted-Average Remaining Contractual Life 2 years 58 days      
Intrinsic Value 874,160mric_ClassOfWarrantOrRightIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range2Member 		[2]      
Range 3 [Member]        
Note 7 - Stockholders' Equity (Details) - Outstanding Warrants [Line Items]        
Exercise Price $ 0.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range3Member 		     
Number Outstanding 2,577,750us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range3Member 		     
Weighted-Average Remaining Contractual Life 2 years 40 days      
Intrinsic Value 206,220mric_ClassOfWarrantOrRightIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range3Member 		[2]      
Range 4 [Member]        
Note 7 - Stockholders' Equity (Details) - Outstanding Warrants [Line Items]        
Exercise Price $ 0.86us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range4Member 		     
Number Outstanding 7,432,021us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range4Member 		     
Weighted-Average Remaining Contractual Life 4 years 357 days      
Intrinsic Value    [2]      
Range 5 [Member]        
Note 7 - Stockholders' Equity (Details) - Outstanding Warrants [Line Items]        
Exercise Price $ 0.97us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range5Member 		     
Number Outstanding 343,578us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range5Member 		     
Weighted-Average Remaining Contractual Life 2 years 6 months      
Intrinsic Value    [2]      
Range 6 [Member]        
Note 7 - Stockholders' Equity (Details) - Outstanding Warrants [Line Items]        
Exercise Price $ 1.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range6Member 		     
Number Outstanding 1,360,000us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range6Member 		     
Weighted-Average Remaining Contractual Life 2 years 127 days      
Intrinsic Value    [2]      
Range 7 [Member]        
Note 7 - Stockholders' Equity (Details) - Outstanding Warrants [Line Items]        
Exercise Price $ 1.19us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range7Member 		     
Number Outstanding 2,727,274us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range7Member 		     
Weighted-Average Remaining Contractual Life 2 years 6 months      
Intrinsic Value    [2]      
Range 8 [Member]        
Note 7 - Stockholders' Equity (Details) - Outstanding Warrants [Line Items]        
Exercise Price $ 1.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range8Member 		     
Number Outstanding 1,233,250us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range8Member 		     
Weighted-Average Remaining Contractual Life 4 years 83 days      
Intrinsic Value    [2]      
Range 9 [Member]        
Note 7 - Stockholders' Equity (Details) - Outstanding Warrants [Line Items]        
Exercise Price $ 8.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range9Member 		     
Number Outstanding 25,444us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= mric_Range9Member 		     
Weighted-Average Remaining Contractual Life 87 days      
Intrinsic Value    [2]      
[1] This weighted-average exercise price reflects the impact of warrant exercise price adjustments triggered by the December 2014 private placement.
[2] Intrinsic value is calculated as the estimated fair value of the Company's stock at December 31, 2014 less the warrant exercise price of in-the-money warrants.