ACQUISITION: (Details Textual) (USD $)	12 Months Ended
	Apr. 30, 2013	Dec. 31, 2012
Business Acquisition Purchase Price Allocation Assets Acquired Liabilities Assumed		$ 1,833,000
Payments to Acquire Businesses, Gross	1,123,000
Business Acquisition Cash Placed In Escrow		400,000
Business Acquisition Contingent Purchase Price Liability		310,000
Business Acquisition Contingent Purchase Price Liability Maximum		1,000,000
Business Acquisition Contingent Purchase Price Liability Fair Value Estimated		310,000
Business Combination Purchase Price Allocation Property Plant And Equipment		401,000
Business Acquisition, Purchase Price Allocation, Amortizable Intangible Assets		2,048,000
Business Acquisition, Purchase Price Allocation, Other Noncurrent Liabilities		$ 616,000