CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Net cash provided by operating activities - continuing operations	$ 9,663,793	$ 2,663,297
Net cash provided by (used in) operating activities - discontinued operations	(80,753)	32,402
Net cash provided by operating activities	9,583,040	2,695,699
Cash flows from investing activities
Maturity of certificate of deposit	0	5,637,538
Additions to property, plant and equipment and construction in progress	(2,551,511)	(1,356,454)
Proceeds from sale of equipment	18,027	526,800
Distribution of earnings from OC-BVI	1,136,250	0
Acquisition of Aerex, net of cash acquired	0	(7,742,853)
Collections on loans receivable	966,651	906,012
Release of restricted cash balance	0	398,744
Net cash used in investing activities - continuing operations	(430,583)	(1,630,213)
Net cash used in investing activities - discontinued operations	0	0
Net cash used in investing activities	(430,583)	(1,630,213)
Cash flows from financing activities
Dividends paid to common shareholders	(2,231,021)	(2,212,791)
Dividends paid to non-controlling interests	0	(182,663)
Dividends paid to preferred shareholders	(5,284)	(5,760)
Issuance (repurchase) of redeemable preferred stock	6,588	(9,598)
Proceeds received from exercise of stock options	0	143,226
(Repayment)/issuance of note payable to related party	(490,000)	490,000
Issuance of note payable to related party	392,000	0
Repayments of demand loan payable	0	(7,000,000)
Net cash used in financing activities - continuing operations	(2,327,717)	(8,777,586)
Net cash used in financing activities - discontinued operations	0	0
Net cash used in financing activities	(2,327,717)	(8,777,586)
Effect of exchange rate changes on cash	0	638
Net increase (decrease) in cash and cash equivalents	6,824,740	(7,711,462)
Cash and cash equivalents at beginning of period	39,126,214	44,792,734
Cash and cash equivalents at end of period	45,950,954	37,081,272
Interest paid in cash	7,074	67,689
Non-cash investing and financing activities
Conversion (on a one-to-one basis) of 368 and 833, respectively, shares of redeemable preferred stock to common stock	221	500
Dividends declared but not paid	1,120,122	1,113,844
Transfers from inventory to property, plant and equipment and construction in progress	147,886	134,362
Transfers from construction in progress to property, plant and equipment	289,915	1,097,165
Common Stock [Member]
Non-cash investing and financing activities
Issuance of respectively, shares for services rendered	203,551	106,415
Redeemable Preferred Stock [Member]
Non-cash investing and financing activities
Issuance of respectively, shares for services rendered	$ 118,485	$ 106,357