Incentive stock plans and stock based compensation (Common Stock Options) (Details) - USD ($)	1 Months Ended			9 Months Ended	12 Months Ended
	Feb. 28, 2017	Mar. 31, 2016	Mar. 28, 2016	Sep. 30, 2016	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted - Stock Options		25,000	100,000
Share-based compensation					$ 9,000
Term for options granted to a 10% or greater holder of total voting stock					3 years
Sharebased Compensation Arrangement By Sharebased Payment Award Exercise Price Of Options Granted Percentage Of Fair Market Value					110.00%
Exercise price		$ 1.34	$ 1.29
Vesting period		3 years	3 years
Number of options cancelled				25,000
Weighted average fair value of stock options granted		$ 0.52	$ 0.50
Outstanding options, weighted average contractual term					1 year
Dividend yield					$ 0
Expected volatility					48.24%
Risk-free interest rate					1.21%
Expected life					4 years
Net revised value after amortized					$ 700
Option, Discount					8.00%
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options expired	2,700,000
Restatement Adjustment [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value of stock options granted					$ 0.08
2003 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance					3,500,000
Number of shares reserved and available for award					700,000
2007 NPDC Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance					7,500,000
Number of shares reserved and available for award					6,141,786
Options outstanding					3,350,000
Options vested and exerisable					3,250,000
Outstanding options, weighted average exercise price					$ 2.27
Outstanding options, aggregate intrinsic value					$ 0