Condensed Consolidated Statements Of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities
Net income	$ 20,962,000	$ 1,703,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	1,379,000	1,178,000
Amortization of intangible assets	372,000	263,000
Provision for bad debt	162,000	261,000
Stock-based compensation	450,000	207,000
Loss (gain) on sale of assets	9,000	(55,000)
Amortization of premiums on investments	96,000	154,000
Deferred income taxes	(18,167,000)	0
Changes in operating assets and liabilities:
Accounts receivable	(2,171,000)	(1,169,000)
Inventories	(730,000)	406,000
Other assets	227,000	(7,000)
Accounts payable	1,167,000	1,113,000
Accrued compensation	(470,000)	(394,000)
Deferred revenue	(166,000)	(208,000)
Other liabilities	(399,000)	(240,000)
Restricted cash	244,000	(233,000)
Net cash provided by operating activities	2,965,000	2,979,000
Investing activities
Purchases of property and equipment	(1,181,000)	(1,147,000)
Net proceeds from sale of assets	18,000	81,000
Purchases of securities available-for-sale	0	(2,617,000)
Maturities of securities available-for-sale	1,869,000	1,095,000
Stock subscription	(1,000,000)	0
Net cash received from (paid for) acquisition	3,000	(3,447,000)
Net cash used in investing activities	(291,000)	(6,035,000)
Financing activities
Issuances of common stock	432,000	173,000
Dividends paid	(2,862,000)	(2,783,000)
Repayment of long-term debt	0	(131,000)
Repayment of obligations under capital leases	(400,000)	(154,000)
Net cash used in financing activities	(2,830,000)	(2,895,000)
Net decrease in cash and cash equivalents	(156,000)	(5,951,000)
Cash and cash equivalents at beginning of period	14,051,000	18,744,000
Cash and cash equivalents at end of period	13,895,000	12,793,000
Non-Cash Investing Activities
Assets acquired by entering into capital lease	1,340,000	425,000
Issuances of common stock for acquisition	$ 2,684,000	$ 0